Eagleton, Clyde
New York University press, 1945
Buku Teks SO
Rees, Martin
Basic Books , 1999
Buku Teks SO
Flynn, James R.
Academic Press, 2013
eBooks
Mandaliem Lembong Halim
Elex Media Komputindo, 2006
Buku Teks SO
Kihara, Taro
John Wiley & Sons, 1978
Buku Teks SO