Gamson, William A.
Dorsey Press , 1968
Buku Teks
Walker, David
Australian National University Press, 1976
Buku Teks
Free Press , 1964
Buku Teks
Maja Zumer, editor
K.G. Saur, 2009
Buku Teks
The International Political Science Association, 2009
Buku Referensi