Boyd, Harper W., Jr., author
Prentice-Hall, 1967
Buku Teks
Belch, George E., author
McGraw-Hill, 2009
Buku Teks
Richard J. Semenik, Thomas C. O'Guinn, Chris Allen, Hans Kaufmann
Wadsworth and Cengage Learning, 2012
Buku Teks
Kalista Adi Darmawan, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2016
UI - Makalah dan Kertas Kerja
Belch, George E., author
McGraw-Hill, 2001
Buku Teks