editor in chief Paul Edward
MacMilan, 1972
Buku Referensi
Roger Cotterrell, Professor Tom D. Campbell
Ashgate, 2001
Buku Teks
Hearn, E. J., author
Pergamon Press, 1985
Buku Teks
Lenin, Vladimir I., author
Foreign Languages Publishing House , 1950
Buku Teks
editor Bertrand Badie; France Dirk Berg-Schlosser; Leonardo Morlino
Sage Publications, 2011
Buku Referensi