Wertheim, Margaret
Doubleday, 1999
Buku Teks
Spinello, Richard A.
Jones and Bartlett Learning, 2017
Buku Teks
Dodge, Martin
Addison Wisley, 2001
Buku Referensi
edited by M. David Ermann, Mary B. Williams and Claudio Gutierrez
Oxford University Press, 1990
Buku Teks
Haynes, Colin
Aslib, 1995
Buku Teks