Harvey, Lee, author
Macmillan, 1993
Buku Teks
McIntyre, Lisa J., author
McGraw-Hill, 2008
Buku Teks
Giddens, Anthony, author
W.W. Norton & Compan, 2005
Buku Teks
Tischler, Henry L.
Wadsworth and Cengage Learning, 2014
Buku Teks
Mckee, James B., author
Holt, Rinehart and Winston, 1969
Buku Teks