Goode, William J.
Prentice-Hall, 1964
Buku Teks
edited by Catharine Coleborne, Dolly MacKinnon
Routledge, 2011
Buku Teks
Waggoner, John M., author
Business One Irwin, 1991
Buku Teks
edited by Jane M. Ussher
Routledge, 1997
Buku Teks
Joron, Guy
Musson Book Co , 1978
Buku Teks