Library Association, 1982
Buku Referensi
Lerner, Berel Dov, author
Routledge , 2002
Buku Teks
Bartholomew, David J., author
John Wiley & Sons, 1981
Buku Teks
Boulding, Kenneth E. (Kenneth Ewart), 1910-1993, author
Fefer and Simons , 1966
Buku Teks
Organisation for Economic Cooperation and Development , 1966
Buku Teks