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An issue of some confusion for many student writers is whether information and ideas acquired during a class lecture require citation. This determination depends to some extent on the nature of the referenced material. Facts readily available elsewhere may not need to be cited, whereas unique observations, opinions, and direct quotations from the lecture usually must be. Seeking clarification of this issue from the instructor is the most prudent course of action.
For specific information on citing lecture material, consult with your instructors, refer to recognized style manuals and research guides, and check out the helpful resources at the Undergraduate Writing Center as well as University libraries.