Matthews, Janice R., author
Cambridge University Press, 2016
Buku Teks
Peacock, Janet L., auhtor
Oxford University Press, 2007
Buku Teks
Charlene Davis
Entrepreneur Press, 2012
Buku Teks
Keeton, William T., author
W.W. Norton, 1968
Buku Teks
Shaw, Mark, author
Laurence King , 2012
Buku Teks