Mayer, Lawrence C
Prentince Hall, 1993
Buku Teks
Deutsch, Karl W
Houghton Mifflin, 1970
Buku Teks
Kothari, Rajni, author
Little, Brown, 1970
Buku Teks
University of Toronto Press, 2014
Buku Teks
Rose, Richard, 1933-, author
Scott, Foreman, 1989
Buku Teks