Pipes, Richard
Mataangin, 2004
Buku Teks
Lukacs, Georg
Ar-Ruzz Media, 2012
Buku Teks
Milivojevic, Dragoljub
Information Service, 1962
Buku Teks
Selznick, Philip
The Free Press of Glencoe, 1960
Buku Teks
Ebenstein, William
Holt Rinehart and Winston, 1964
Buku Teks