Wrightsman, Lawrence S., author
Wadsworth/Thomson Learning, 2001
Buku Teks
Lynch, Virginia A., author
Elsevier Mosby, 2011
Buku Teks
Saferstein, Richard, author
Prentice-Hall, 1995
Buku Teks
Ratay, Robert T., author
McGraw-Hill, 2010
Buku Teks
Ratay, Robert T., editor-in-chief
McGraw-Hill, 2000
Buku Referensi