First, the description of a basic phenomenon, a standard experimental technique, a fundamental analysis, or a commonly used numerical method should never be copied from any source—be it a book, a journal article, a website, or even someone else’s presentation at a seminar or a conference. Instead, you must write a description in your own words. Although common phrases need not be enclosed within quotation marks, copying someone else’s description—even with cosmetic changes—amounts to plagiarism. The citation of informative sources for such material depends on its antiquity, context, and readership. There is no need to cite a historical work such as Principia for Newton’s laws of motion, unless a historical issue is being discussed.11 Citation of a widely used textbook is advisable if most readers are expected to be novice researchers, but it is essential in a journal that usually caters to a different discipline. Recently published review papers may also be cited to assist readers.