Gelder, Henk van
Thomas RAP, 1993
Buku Teks
Cohen, John Michael, 1903-1989
Viking, 1993
Buku Referensi
Fleming H Revel Co., 1947
Buku Teks
Sharpe, Gareth
Guinness Publishing, 1994
Buku Referensi
edited by Angela Partington
Oxford University Press, 1993
Buku Referensi