In Bobst, most reference books are either online or located in the 1st Floor Reference Center. A few are located on the 5th and 6th floors.
Encyclopedias and biographies are great resources to familiarize yourself with the background information on a given subject.
Hint: After you've read an encyclopedia or biography article to get a broad understanding of a subject, use the article bibliography to dive further into the scholarly literature on that topic.
Credo reference is an online collection of dictionaries, encyclopedias, biographical sources, quotations, bilingual dictionaries, and measurement conversions covering topics from the arts to the sciences.