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