edited by James A. Clifton
Houghton Mifflin, 1968
Buku Teks
Langdridge, Darren, author
Pearson, 2004
Buku Teks
Novick, Melvin R.
McGraw-Hill, 1974
Buku Teks
McNeill, Patrick, author
Routledge, 1990
Buku Teks
White, Theresa L., author
Wadsworth and Cengage Learning, 2013
Buku Teks