edited by Colin Clarke
Macmillan, 1984
Buku Teks
Cowan, James, author
Simon & Schuster, 1991
Buku Teks
Pallottiono, Massimo
Penguin Books, 1956
Buku Teks
Srikandi Waluyo, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 1983
UI - Skripsi (Membership)
Burgess, Anthony
Heinemann , 1985
Buku Teks