Karp, Rashelle S.
Garland Publishing, Inc., 1991
Buku Referensi
Gillespie, John Thomas, 1928-
Libraries Unlimited, 1998
Buku Teks
HMSO , 1995
Buku Teks SO
Blanshard, Catherine
Library Association Publishing, 1998
Buku Teks SO
Morgan, John Smith, 1921-
New York, N.Y., American Management Asseciation
Buku Teks