Morris, Richard B., author
Harper & Row, 1961
Buku Teks
GK-Hall, 1994
Buku Teks
Bettany, G.T., author
Bracken Books, [date of publication not identified]
Buku Referensi
foreword by Rex Warner
Galahad Books, 1975
Buku Referensi
consulting editor, Wendy Doniger
Encyclopaedia Britannica, Inc., 2006
Buku Referensi