Carr, Edward Hallet, author
Macmillan, 1954
Buku Teks
Pokshishevsky, V., author
Progress, 1974
Buku Teks
Beloff, Max, author
Oxford University Press, 1947
Buku Teks
Fischer, Louis, author
Princeton University Press, 1951
Buku Teks
Freund, H. A.
1945, Angus and Robertson
Buku Teks