Milivojevic, Dragoljub
Information Service, 1962
Buku Teks
Selznick, Philip, author
The Free Press of Glencoe, 1960
Buku Teks
Pipes, Richard, author
Mataangin, 2003
Buku Teks
Ebenstein, William, author
Holt Rinehart and Winston, 1964
Buku Teks
Isata Jaya, 1996
Buku Teks