University of Science and Arts of Oklahoma
These are collections of electronic reference books that include books on sex and gender.
The following are a few recommended general reference works on sex and gender issues. Reference books are marked with red stickers on their spines. They do not circulate; you must use them in the library. Click on a book to go to its catalog record.
Encyclopedia of Marriage and the Family by 
International Encyclopedia of Men and Masculinities by 
Encyclopedia of Sexual Behavior and the Law by In almost all cases, Wikipedia is not acceptable as a source in academic research. Anyone can add or revise Wikipedia content, and that content may be incorrect, incomplete, or biased. The only people overseeing the quality of the content are other Wikipedia users.
In contrast, the reference sources here are by academic publishing companies, and the entries have been written and edited by experts.
Wikipedia can be useful for getting a quick overview of a well-studied, non-controversial topic. Then, with that background established, you can proceed to scholarly sources. Be wary of articles on obscure or controversial topics, as they are more likely to be biased or to be the work of a limited number of people.
