Ullmann, Leonard P., author
Prentice-Hall, 1975
Buku Teks
Page, James Daniel, author
Tata McGraw-Hill, 1994
Buku Teks
Halgin, Richard P., author
Harcourt Brace Jovanovich College, 1993
Buku Teks SO
Barlow, David H., author
Connecticut Cengage Learning, 2015
Buku Teks
Nolen-Hoeksema, Susan, author
McGraw-Hill, 2001
Buku Teks