Rice, John K.
Holt, Rinehart and Winston , 1973
Buku Teks SO
McCracken, Daniel D.
John Wiley & Sons, 1974
Buku Referensi
Nyoman Susila
Baskara, 1983
Buku Teks SO
Hughes, Charles E.
John Wiley & Sons, 1978
Buku Teks SO
Maratek, Samuel L.
Academic Press, 1983
Buku Teks SO