McCormick, John, 1954-, author
Wadsworth, 2010
Buku Teks
Hauss, Charles, author
Wadsworth/Thomson Learning, 2003
Multimedia
Wiarda, Howard J., author
Thomson Wadsworth, 2000
Buku Teks
Powell, G. Bingham, author
Pearson Education, 2015
Buku Teks
Banfield, Edward C., author
Random House, 1967
Buku Teks