Bish, Robert L.
Economic principles and urban problems
Prentice-Hall, 1974
 Buku Teks
Shure, Myrna B.
Thinking parent, thinking child : how to turn your most challenging everyday problems into solutions
McGraw-Hill , 2005
 Buku Teks
Population: challenging world crisis
edited by Bernard Berelson
Information Agency, 1975
 Buku Teks
Population : challenging world crisis
edited by Bernard Berelson
Voice of America, 1975
 Buku Teks
Han, Lintao
Miracles of life-challenging cancer
New World Press, 2009
 Buku Teks