Henderson's Dictionary of Biology by 
Encyclopedia of Evolution by 
Dictionary of Bioscience by 
Grzimek's Animal Life Encyclopedia by You can look for eBooks in the databases below. Many titles can be downloaded to a reader, and most are easily searchable.
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Reference sources like encyclopedias (and dictionaries) are books that provide small bits of information when you're trying to get a deep understanding of an idea/person/place/thing/event. A reference resources contains reliable information that can be verified, cited, and included in your research.
