editors, Robert E. Ward and Roy C. Macridis
Prentice-Hall, 1963
Buku Teks
East, W. Gordon
Methuen, 1950
Buku Teks
edited by Mark Williams
Edward Elgar, 2013
Buku Teks
Cambridge University Press, 2016
eBooks
edited by W. Gordon East and O.H.K. Spate
Methuen, 1950
Buku Teks