First, gather background information of your topic in general or specialized reference books such as encyclopedias, dictionaries or handbooks. A reference book can be used to start a research project by helping the researcher to find short authoritative descriptions or summaries of important topics.These reference sources provide useful overviews of a topic and may include in their bibliographies resources you can further use in your paper.
Animal Behavior Desk Reference by 
The Cambridge Encyclopedia of Darwin and Evolutionary Thought by 
Dictionary of Biology by 
Dictionary of Cell and Molecular Biology by 
Encyclopedia of Insects by 
Encyclopedia of Molecular Biology by 
Grzimek's animal life encyclopedia[electronic resource] : evolution by 
Grzimek's Animal Life Encyclopedia by 
Life: the Science of Biology
Wiley-Blackwell Encyclopedia of Human Evolution by 
