Mitrany, David
Quadrangle Books, 1966
Buku Teks
Tadjoeddin Noor, author
Former Counsellor, 1976
Buku Teks
Tadjoeddin Noor, author
Mutiara, 1974
Buku Teks
Gross, Ernest A.
Harper & Brothers, 1962
Buku Teks
Dean, Vera Micheles
McGraw-Hill, 1946
Buku Teks