Findley, Roger W., author
West Publishing, 1983
Buku Teks
Findley, Roger W., author
West Publishing, 1996
Buku Teks
Guruswamy, Lakshman D., author
Thomson/West, 2012
Buku Teks
Findley, Roger W., author
West Publishing, 1992
Buku Teks
Kubasek, Nancy K., author
Pearson - Prentice Hall, 2005
Buku Teks