Armstrong, Michael, author
Crest Publishing House, 1999
Buku Teks
Hunt, John W., author
McGraw-Hill, 1976
Buku Teks
Desiana Dwi Barianti, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2002
UI - Tesis (Membership)
Haworth Press, 1995
Buku Referensi
Goldsmith, Selwyn
McGraw-Hill, 1967
Buku Teks