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I once jokingly included in a thesis:

The equations of motion [1] for a rigid body can be reformulated as…

[1] I. Newton, Philosophiæ Naturalis Principia Mathematica, 1687.

While citing Newton's work for his equations of motion might be over the top, there is a valid underlying question: what criteria can one use to know when a work is “such a classic” that it doesn't warrant citation anymore.

I'll give example in my field:

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I would cite anything that is not taught at Master level (or below), regardless of the date of publication. –  userxxxxx Nov 21 '12 at 9:27
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I once cited Darwin and one of the reviewers thought it was funny –  Leon palafox Nov 21 '12 at 10:02
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I think Newton himself gives you a rule: "If I have seen further it is by standing on the shoulders of giants". Citations are meant to refer to works you used (explicitly) in your research. Otherwise most papers would cite Cantor and Dedekind for constructing the real numbers. –  user3836 Nov 22 '12 at 11:10
    
@Procrastinator this seems to be somewhat field-dependent. While I've never been explicitly told this, my experience in reading and writing high-energy physics papers is that citations are as much a way to acknowledge the originator of an idea as they are a way to demonstrate which resources you used. –  David Z Nov 27 '12 at 1:52
    
@DavidZaslavsky I see your point but there is always a "backward" limit in any area. (A bit tongue-in-cheek, again) I am sure Leicippus and Democritus are not highly cited in your area despite pioneering the atomism. –  user3836 Nov 27 '12 at 9:04

2 Answers 2

up vote 17 down vote accepted

The ultimate question is what would the average well-informed bachelor's or master's degree-holder in your field be expected to know.

Something that comes up in an undergraduate textbook, or is a commonly known and easily demonstrated fact (for example, the definition of the error function), probably doesn't need to be cited, because everyone in your field would be expected to know it. On the other hand, if you're publishing in a "general interest" journal, then you might want to assume a lower "base" of knowledge, and cite a commonly available source.

However, if it's something that's a very specific tool or fact (or a derivation, etc.), then it probably merits a citation in any case.

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What they taught me, is that the main criterion is:

is there a standard textbook covering the topic I want to cite?

If there is, then rather point to it than to the original paper. And only don't point to it, when you are sure, that the reader is familiar with the topic (e.g. equations of motions).

However, when you want to point to a very specific observation on discovery, still you might like to point to the original paper.

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