Smith, Rhona K.
Routledge, 2010
Buku Teks
Forsythe, David P., 1941-
University of Nebraska Press, 1983
Buku Teks
Forsythe, David P., 1941-
Cambridge University Press, 2012
Buku Teks
McBeth, Adam
Oxford Univ Press, 2011
Buku Teks
Mayer, Ann Elizabeth
Westview Press, 1995
Buku Teks