Blake, Susan
Blacstone Press, 1996
Buku Teks
Waltner-Toews, David, 1948-, author
Cambridge University Press, 2004
Buku Teks
Ditch, W
Edward Arnold, 1994
Buku Teks
Baughman, Robert P., editor
Springer, 2012
eBooks
Alpert, Jack N., author
Springer, 2012
eBooks