Johnstone, Paul
Routledge , 1988
Buku Teks
edited by Jacquetta Hawkes
McGraw-Hill, 1974
Buku Referensi
Ehrenberg, Margaret, author
British Museum Publications, 1989
Buku Teks
Trimingham, J. Spencer
SCM Press , 1956
Buku Teks
Pfeiffer, John E., author
McGraw-Hill , 1977
Buku Teks