edited by Alex Hunter
Melbourne University Press, 1965
Buku Teks
G.D.H.Cole
Carter lane, 1955
Buku Teks
Mills, Edwin S., author
Johns Hopkins Press, 1972
Buku Teks
Womack, James G., author
Benziger Bros, 1966
Buku Teks
Cole, George Douglas Howard, 1889-1959, author
Routledge and Kegan Paul, 1955
Buku Teks