Rishel, James B., author
Mcgraw-Hill, 2002
Buku Referensi
Mays, Larry W.
McGraw-Hill, 2000
Buku Referensi
by Thomas B. Glans [and others]
Holt, Rinehart and Winston, 1968
Buku Teks
Kroeber, Donald W.
Macmillan Publishing Company, 1990
Buku Teks
Bielawski, Larry
Prentice-Hall, 1997
Buku Teks