Greenstein, Theodore N., author
Sage Publications, 2001
Buku Teks
Gravetter, Frederick J., author
CT Cengage Learning, 2016
Buku Teks
Gravetter, Frederick J., author
Cengage, 2018
Buku Teks
Gravetter, Frederick J., author
Wadsworth, 2012
Buku Teks
Cozby, Paul C., author
McGraw-Hill, 2012
Buku Teks