Stark, W.
Kegan Paul, Trenck, Trubner & Co., 1947
Buku Teks
edited by Richard L. Watson
The Free Press, 1968
Buku Teks
Northrop, F. S. C.
Macmillan, 1954
Buku Teks
Kitzinger, Uwe W.
Frederick A. Praeger, 1963
Buku Teks
McGovern, Edmond
Globefield Press, 1982
Buku Teks