The Commercial Press , 1935
Buku Teks
Devitto, Don, author
Glenlake , 2001
Buku Teks
Friedman, David D., author
South-Western Publishing, 1986
Buku Teks
Pashigian, B. Peter, author
McGraw-Hill, 1998
Buku Teks
edited by Almarin Phillips and Oliver E. Williamson
University of Pennsylvania Press , 1967
Buku Teks