Gianakaris, C.J.
Houghton Miffiln, 1975
Buku Teks
Wessels, Charlyn, author
Oxford University Press, 1991
Buku Teks
Patty, C. Wayne, author
PWS Publishing, 1993
Buku Teks
Siebert, Eleanor D., author
McGraw-Hill, 1982
Buku Teks
Beiser, Arthur, author
Addison-Wesley, 1964
Buku Teks