Nanney, T. Ray, author
Prentice-Hall, 1981
Buku Teks
McCracken, Daniel D., author
John Wiley & Sons, 1974
Buku Referensi
Rice, John K., author
Holt, Rinehart and Winston , 1973
Buku Teks
Hughes, Charles E., author
John Wiley & Sons, 1978
Buku Teks
F. Soesianto, author
Andi, 1986
Buku Teks