Pipes, Richard, author
Mataangin, 2003
Buku Teks
Pipes, Richard, author
Mataangin, 2004
Buku Teks
Lukacs, Georg, author
Ar-Ruzz Media, 2012
Buku Teks
Milivojevic, Dragoljub
Information Service, 1962
Buku Teks
Selznick, Philip, author
The Free Press of Glencoe, 1960
Buku Teks