Martin, Andre J.
John Wiley & Sons, 1995
Buku Teks
edited by Martin Chritopher and Gordon Wills
George Allen and Unwin, 1972
Buku Teks
Smykay, Edward W., author
Macmillan, 1973
Buku Teks
Gopal, Christopher, author
Business One Irwin, 1993
Buku Referensi
James A. Tompkins, Dale A. Harmelink [editors]
McGraw-Hill, 1994
Buku Referensi