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
Penner, R.C.
Princeton University Press, 1992
Buku Teks SO
Hall, Marshall
John Wiley & Sons, 1967
Buku Teks SO