Desjardins, Joseph, author
McGraw-Hill, 2014
Buku Teks
Jackson, Jennifer
Blackwell Publishers, 1996
Buku Teks
Desjardins, Joseph, author
McGraw-Hill, 2003
Buku Teks
edited by Peter W.F. Davies
Routledge, 1997
Buku Teks
Velasquez, Manuel G., author
Pearson, 2006
Buku Teks