Blanchard, Wendell
Buku Teks
Greesaye, Jean Brethe de la, author
Recueil Sirey, 1947
Buku Klasik
Crocker, Walter R. (Walter Russell), 1902-, author
George Allen and Unwin, 1949
Buku Teks
Goshal, Kumar
Sheridan House Publisher, 1948
Buku Teks
Walker, E. A.
The University Press, 1945
Buku Teks