edited by Archie Brown, Michael Kaser and Gerald S. Smith
Cambridge University Press, 1994
Buku Referensi
Beloff, Max, author
Oxford University Press, 1947
Buku Teks
Carr, E. H. (Edward Hallet), author
Macmillan, 1990
Buku Teks
Frederick A, Praeger; George Allen and Unwin Ltd., 1964
Buku Teks
Alexandrova, Vera
New York Doubleday 1963
Buku Teks