Voiles, Price R., author
Glencoe, 1993
Buku Teks
Ebert, Ronald J., author
Prentice-Hall, 2003
Buku Teks
Ebert, Ronald J., author
Pearson, 2015
Buku Teks
Anderson, W.M. (Wendy M.), author
Wiley Publishing , 2013
Buku Teks
Smiith, Jeremy J., author
Routledge, 2005
Buku Teks