Tucker, Alan
John Wiley & Sons, 1980
Buku Teks SO
Townsend, Michael
The Benjamin Cumming, 1987
Buku Teks SO
Bryant, Victor
Cambridge University Press, 1993
Buku Teks SO
Hall, Marshall
John Wiley & Sons, 1967
Buku Teks SO
Penner, R.C.
Princeton University Press, 1992
Buku Teks SO