Masca, Gaetano
McGrow-Hill, 1939
Buku Teks
Frank, Andre Gunder
Monthly Review Press, 1972
Buku Teks
Rickard, John David, author
Australian National University Press, 1976
Buku Teks
Saul, John S., author
Monthly Review Press, 1981
Buku Teks
Encel, S.
F.W. Cheshire, 1970
Buku Teks