Smith, Peter B., author
Harvester Wheatsheaf, 1993
Buku Teks
DeLamater, John D., author
Colorado Westview Press, 2014
Buku Teks
Baron, Robert A., author
Pearson, 2009
Buku Teks
Franzoi, Stephen L., author
McGraw-Hill, Higher Education, 2009
Buku Teks
Myers, David G., author
McGrow-Hill , 1987
Buku Teks