Reference sources exist to give you reliable background information and help you to narrow down your topic. They are also very helpful for definitions. If you are searching for an in-depth discussion of a particular social theory, try the Sage Knowledge database below.
Two books from this database might prove especially helpful:
Summon, our Web Scale Discovery software, allows you to easily find content in e-Reference books. It does not cover ALL our e-Reference books, but most are covered.
The box above allows you to search Summon for only reference material. You may want to add further filters, such as date and discipline (look at the left hand column). Remember that you will turn up both kinds of reference article, the short kind and the more detailed kind. Also in some cases you will not be directed to the specific article, but rather to the homepage of the reference book. Just search the topic you want (it will be on the sidebar to the right) and you will find the article.