Pritchard, John, author
Viking, 1992
Buku Referensi
general editor Michael Renshall
Butterworth, 1990
Buku Referensi
Sudargo Gautama, author
[publisher not identified], [date of publication not identified]
Buku Teks
Sudargo Gautama, author
Citra Aditya Bakti, 1995
Buku Teks
Peter C. Anderson
McGraw-Hill, 1992
Buku Teks