Edited by: Howard J. Wiarda
Thomson, 2000
Buku Teks
Adian Husaini, author
Dea Press, 2000
Buku Teks
Carritt, E. F.
At The Clarendon Press, 1935
Buku Teks
Ray, James Lee, author
Houghton Mifflin, 1987
Buku Teks
Kaarbo, Juliet, author
Wadsworth, Cengage Learning, 2011
Buku Teks