Tannsjo, Torbjorn, author
Edinburgh University Press, 2010
Buku Teks
Jackson, Jennifer
Blackwell Publishers, 1996
Buku Teks
Desjardins, Joseph, author
McGraw-Hill, 2003
Buku Teks
Des Jardins, Joseph R., author
Wadsworth, 1997
Buku Teks
White, Thomas I., author
NJ John Wiley & Sons,, 2017
Buku Teks