Burns, Paul C., author
Houghton Miffiln, 1984
Buku Teks
Bovee, Courtland L., author
McGraw-Hill, 1992
Buku Teks
Bovee, Courtland L., author
Pearson, 2014
Buku Teks
Bovee, Courtland L., author
McGraw-Hill, 1993
Buku Teks
Dumbauld, Edward
University of Oklahoma Press, 1957
Buku Teks