Locke, John, author
Walter J. Black, 1947
Buku Teks
Morgenthau, Hans J., author
The University of Chicago Press, 1962
Buku Teks
Soltau, Roger H.
Longmans, Green , 1951
Buku Teks
Soltau, Roger H.
Longmans, Green , 1960
Buku Teks
Laski, Harold J., author
George Allen and Unwin, 1957
Buku Teks