A reference source is a compendium of authoritative information, compiled for ease of use.
Reference materials include
Dictionaries and Encyclopedias
Grammar
Oxford Dictionary of English Grammar (Print)
Call Number: Ref PE1097 .C47
Thesauri
Thesaurus.com. A Web version of Roget's Thesaurus
American Heritage Thesaurus (Print)
Call Number: Ref PE1591 .A44 2005
Oxford Dictionary of Synonyms and Antonyms (Print)
Call Number: Ref PE1591 .S765 2007
Quotations
Bartlett's Familiar Quotations at Bartleby.com
Bartlett's Familiar Quotations (Print)
Call Number: Ref PN608 .B27 2002