Hays, William Lee, 1926-1995, author
Holt, Rinehart and Winston, 1973
Buku Teks
Gravetter, Frederick J., author
Wadsworth and Cengage Learning, 2013
Buku Teks
Linneman, Thomas J., author
Routledge, 2018
Buku Teks
by Bruce L. Brown [and others]
John Wiley & Sons, 2012
Buku Teks
Campbell, Donald T., author
Sage, 2001
Buku Teks