Burfeind, James W. , author
Jones and Bartlett Publishers, 2011
Buku Teks
Silverthorn, Dee Unglaub, author
Prentice-Hall, 2001
Buku Teks
Silverthorn, Dee Unglaub, author
Pearson, 2016
Buku Teks
Howe, Roger T., author
Prentice-Hall, 1997
Buku Teks
Hill, Charles W. L., author
Houghton Mifflin , 1989
Buku Teks