Source: Credo Reference
Credo Reference is a good go-to "Reference" database for concept maps, terminology help and more.
Credo Reference UNT Libraries linked off of the Discover Catalog link
Sage Knowledge
"The premier social sciences platform for SAGE and CQ Press book, reference, and video content." (from Vendor)
Gale Virtual Reference Library
Resource Type: Research Database with searchable Full Text accessTitle/Alternate Title: Gale Virtual Reference LibraryContents: Selected reference ebooks, including Cambridge Guide to Children's Books in English, Encyclopedia of Science & Religion, Encyclopedia of Science Technology & Ethics, Encyclopedia of Sociology, Gale Encyclopedia of Neurological Disorders, and World of Forensic ScienceHelp Links: Click Help link at top of page
Oxford English Dictionary
Resource Type: DictionaryTitle/Alternate Title: Oxford English Dictionary Online, OED OnlineSubjects Covered: A guide to the meaning, history, and pronunciation of over half a million words, both present and past. Contains words from across the English-speaking
The Encyclopedia of Addictions and Addictive Behaviors by 
Handbook of Rehabilitation Psychology by 
Diagnosis and Treatment of Substance-Related Disorders by 
