Bisson, T.A.
The Foreign Policy Association , 1941
Buku Teks
Dobby, E.H.G. (Ernest Henry George), 1906-1981
University of London Press, 1950
Buku Teks
Dobby, E.H.G. (Ernest Henry George), 1906-1981
University of London Press, 1953
Buku Teks
Henderson, William
MIT Press, 1963
Buku Teks
Dobby, E.H.G. (Ernest Henry George), 1906-1981
University of London, 1950
Buku Teks