Small, R.J.
Longman, 1993
Buku Teks
Hancock, William A., author
McGraw-Hill, 1982
Buku Teks
by Curtis E. Tate Jr. ... [and others]
Business Publication, 1982
Buku Teks
Mellor, David, author
PC Publications, 1993
Buku Teks
Hodgetts, Richard M., author
Harcourt College Publishers, 2001
Buku Teks