"Ethics, copyright laws, and courtesy to readers require authors to identify the sources of direct quotations and of any facts or opinions not generally known or easily checked."--
Chicago Manual of Style, 15th edition (Chicago: Chicago Univ. Press), p. 59
Whenever you quote or base your ideas on another person's work, you must document the source you used. Even when you do not quote directly from another work, if reading that source contributed to the ideas presented in your paper, you must give the authors proper credit.
Citing Your Sources - a brief online guide to the main citation styles and a brief discussion on what constitutes plagiarism.
MLA handbook for Writers of Research Papers. 7th edition. New York : Modern Language Association of America, 2009. Doe Reference Reference Hall LB2369 .G53 2009 Main Gardner Stacks LB2369 .G53 2009 Many older editions available throughout the UCB libraries.
Reference managers (also called citation managers or bibliographic management software) offer a way to save, organize and manage references. Many work with word processing software to format in-text citations and bibliographies for papers and theses, allow you to share references, and enable you to attach or link PDFs to a citation record.