Outstanding reference sources: the 1997 selection of new titles
 Artikel Jurnal
Bryant, David
Finding information the library way: a guide to reference sources
Connecticut Library Professional, 1987
 Buku Teks SO
Reference sources for small and medium-sized libraries
Jack O'Gorman, editor
[American Management Association, ], 2008
 eBooks
Katz, Wiliiam A.
Introduction to reference work : volume I, basic information sources / William A. Katz
McGraw-Hill, 1992
 Buku Referensi
Frost, Carolyn O.
Media access and organization : a cataloging and reference sources guide for nonbook materials
Libraries Unlimited, 1989
 Buku Teks SO