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
Frederick A, Praeger; George Allen and Unwin Ltd., 1964
Buku Teks
Alexandrova, Vera
New York Doubleday 1963
Buku Teks
Garder, Michel
Frederick A. Praeger, 1966
Buku Teks