Held David
Models of democracy
 Buku Teks
Held, David
Models of democracy
Polity Press, 1997
 Buku Teks
McQuaill, Denis
Communications models
Longman, 1984
 Buku Teks
McQuaill, Denis
Communications models
Longman, 1984
 Buku Teks
Guttman, Irwin
Linear Models
John Wiley & Sons, 1982
 Buku Teks