Boudin, Louis B., author
Russell and Russell, 1932
Buku Teks
Toynbee, Arnold J., author
Oxford University Press, 1956
Buku Teks
edited by William Bridgwater dan Seymour Kurtz
Columbia University Press, 1963
Buku Referensi
selected and introduced by Roy Harris
Routledge/Thoemmes Press, 1995
Buku Referensi
editors, Mannque Rho and Denys Wilkinson
North-Holland , 1979
Buku Teks