Gallagher, Matthew P., author
Frederick A. Preager, 1963
Buku Teks
Fischer, Louis, author
Princeton University Press, 1951
Buku Teks
Frederick A, Praeger; George Allen and Unwin Ltd., 1964
Buku Teks
Carr, Edward Hallet, author
Macmillan, 1954
Buku Teks
Lamont, Corliss, author
Philosophical Library, 1952
Buku Teks