Bartholomew, David J., author
John Wiley & Sons, 1981
Buku Teks
Boulding, Kenneth E. (Kenneth Ewart), 1910-1993, author
Fefer and Simons , 1966
Buku Teks
edited by Roger E. Backhouse, Philippe Fontaine
Cambrigde University Press, 2014
Buku Teks
Cambridge University Press, 2014
Buku Teks
United Nations Educational, Scientific and Cultural Organization (UNESCO)
UNESCO, 1984
Buku Teks