Artikel Jurnal
Jack O'Gorman, editor
[American Management Association, ], 2008
eBooks
Bryant, David
Connecticut Library Professional, 1987
Buku Teks
Katz, Wiliiam A.
McGraw-Hill, 1992
Buku Referensi
Wynar, Bohdan S.
Libraries Unlimited, Inc., 1967
Buku Teks