Carolyn C
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A (final) bibliography is a list of the sources you used to get information for your report. It is included at the end of your report, on the last page (or last few pages).
A working bibliography is a listing (usually on 3x5 cards) of possible sources (books, articles, pamphlets, etc.) that you might use for gathering information and writing your research paper. It will be a longer bibliography than the one in your final paper.
The working bibliography will evolve and change as you gather new sources and eliminate those that are less useful. Some of the sources may be too technical; some sources may be too general, or unduly biased, inaccurate, or out of date. These are areas where your critical judgment must come into play.