Van Horne, James Carter, 1935-
Prentice-Hall, 1980
Buku Teks
Van Horne, James Carter, 1935-
Prentice Hall International, 1995
Buku Teks SO
Block, Stanley B.
Irwin, 1994
Buku Teks
Block, Stanley B.
McGraw-Hill, 2002
Buku Teks
Asch, David
Crest Publishing House, 1999
Buku Referensi