Reible, Danny D.
Lewis Publishers, 1999
Buku Teks
Peavy, Howard S., author
McGraw-Hill , 1985
Buku Teks
Peavy, Howard S., author
McGraw-Hill, 1985
Buku Referensi
Sincero, Arcadio P., author
Prentice-Hall, 1996
Buku Teks
Davis, Mackenzie Leo, 1941-, author
McGraw-Hill, 1991
Buku Teks