“A number of years ago, when I was a freshly-appointed instructor, I met, for the first time, a certain eminent historian of science. At the time I could only regard him with tolerant condescension.
I was sorry of the man who, it seemed to me, was forced to hover about the edges of science. He was compelled to shiver endlessly in the outskirts, getting only feeble warmth from the distant sun of science- in-progress; while I, just beginning my research, was bathed in the heady liquid heat up at the very center of the glow.
In a lifetime of being wrong at many a point, I was never more wrong. It was I, not he, who was wandering in the periphery. It was he, not I, who lived in the blaze.
I had fallen victim to the fallacy of the 'growing edge;' the belief that only the very frontier of scientific advance counted; that everything that had been left behind by that advance was faded and dead.
But is that true? Because a tree in spring buds and comes greenly into leaf, are those leaves therefore the tree? If the newborn twigs and their leaves were all that existed, they would form a vague halo of green suspended in mid-air, but surely that is not the tree. The leaves, by themselves, are no more than trivial fluttering decoration. It is the trunk and limbs that give the tree its grandeur and the leaves themselves their meaning.
There is not a discovery in science, however revolutionary, however sparkling with insight, that does not arise out of what went before. 'If I have seen further than other men,' said Isaac Newton, 'it is because I have stood on the shoulders of giants.”
― Isaac Asimov, Adding a Dimension: Seventeen Essays on the History of Science
How to Quote a Source
Introducing a quotation
One of your jobs as a writer is to guide your reader through your text. Don't simply drop quotations into your paper and leave it to the reader to make connections.
Integrating a quotation into your text usually involves two elements:
A signal that a quotation is coming--generally the author's name and/or a reference to the work
An assertion that indicates the relationship of the quotation to your text
Often both the signal and the assertion appear in a single introductory statement, as in the example below. Notice how a transitional phrase also serves to connect the quotation smoothly to the introductory statement.
Ross (1993), in her study of poor and working-class mothers in London from 1870-1918 [signal], makes it clear that economic status to a large extent determined the meaning of motherhood [assertion]. Among this population [connection], "To mother was to work for and organize household subsistence" (p. 9).
The signal can also come after the assertion, again with a connecting word or phrase:
Illness was rarely a routine matter in the nineteenth century [assertion]. As [connection] Ross observes [signal], "Maternal thinking about children's health revolved around the possibility of a child's maiming or death" (p. 166).
Short direct prose
Incorporate short direct prose quotations into the text of your paper and enclose them in double quotation marks:
According to Jonathan Clarke, "Professional diplomats often say that trying to think diplomatically about foreign policy is a waste of time." 1
Longer prose quotations
Begin longer quotations (for instance, in the APA system, 40 words or more) on a new line and indent the entire quotation (i.e., put in block form), with no quotation marks at beginning or end, as in the quoted passage from our Successful vs. Unsucessful Paraphrases page.
Rules about the minimum length of block quotations, how many spaces to indent, and whether to single- or double-space extended quotations vary with different documentation systems; check the guidelines for the system you're using.
Quotation of Up to 3 Lines of Poetry
Quotations of up to 3 lines of poetry should be integrated into your sentence. For example:
In Julius Caesar, Antony begins his famous speech with "Friends, Romans, Countrymen, lend me your ears; / I come to bury Caesar, not to praise him" (III.ii.75-76).
Notice that a slash (/) with a space on either side is used to separate lines.
Quotation of More than 3 Lines of Poetry
More than 3 lines of poetry should be indented. As with any extended (indented) quotation, do not use quotation marks unless you need to indicate a quotation within your quotation.
Punctuating with Quotation Marks
With short quotations, place citations outside of closing quotation marks, followed by sentence punctuation (period, question mark, comma, semi-colon, colon):
Menand (2002) characterizes language as "a social weapon" (p. 115).
With block quotations, check the guidelines for the documentation system you are using.
Commas and periods
Place inside closing quotation marks when no parenthetical citation follows:
Hertzberg (2002) notes that "treating the Constitution as imperfect is not new," but because of Dahl's credentials, his "apostasy merits attention" (p. 85).
Semicolons and colons
Place outside of closing quotation marks (or after a parenthetical citation).
Question marks and exclamation points
Place inside closing quotation marks if the quotation is a question/exclamation:
Menand (2001) acknowledges that H. W. Fowler's Modern English Usage is "a classic of the language," but he asks, "Is it a dead classic?" (p. 114).
[Note that a period still follows the closing parenthesis.]
Place outside of closing quotation marks if the entire sentence containing the quotation is a question or exclamation:
How many students actually read the guide to find out what is meant by "academic misconduct"?
Quotation within a quotation
Use single quotation marks for the embedded quotation:
According to Hertzberg (2002), Dahl gives the U. S. Constitution "bad marks in 'democratic fairness' and 'encouraging consensus'" (p. 90).
[The phrases "democratic fairness" and "encouraging consensus" are already in quotation marks in Dahl's sentence.]
Indicating Changes in Quotations
Quoting Only a Portion of the Whole
Use ellipsis points (. . .) to indicate an omission within a quotation--but not at the beginning or end unless it's not obvious that you're quoting only a portion of the whole.
Adding Clarification, Comment, or Correction
Within quotations, use square brackets [ ] (not parentheses) to add your own clarification, comment, or correction.
Use [sic] (meaning "so" or "thus") to indicate that a mistake is in the source you're quoting and is not your own.
Notes1. "The Conceptual Poverty of U.S. Foreign Policy," Atlantic, September 1993, 55.