Dorn, William S.
John Wiley & Sons, 1972
Buku Teks
McCracken, Daniel D.
John Wiley & Sons, 1974
Buku Referensi
Chivers, Ian
Springer, 2012
eBooks
Rice, John K.
Holt, Rinehart and Winston , 1973
Buku Teks
Kreitzberg, Charles B.
Harcourt Brace Javanovich, 1982
Buku Teks