Cook, Chris, author
Macmillan, 1980
Buku Teks
Lines, June, author
Kogan Page, 1994
Buku Teks
edited by Patrick Brantlinger and William B. Thesing
Blackwell, 2002
Buku Referensi
American Management Association , 1986
Buku Teks
Collier, Richard, 1961-, author
Routledge, 1995
Buku Teks