Blazek, Ron
Libraries Unlimited, 2000
Buku Referensi
Keaveney, Sydney Starr
Gale Research Co., 1974
Buku Teks
edited by Stephen Goddard
Barnes & Noble Books , 1983
Buku Referensi
Schwartz, Mortimer D.
Gale Research, 1977
Buku Teks
Carl M. White and associates: William W. Brickman ... [and others]
American Library Assoiation, 1973
Buku Referensi