Stewart, Valerie
Change : the challenge for management
McGraw-Hill, 1983
 Buku Teks SO
Indonesia : the challenge of change
edited by Richard W. Baker [and others]
Institute of Southeast Asian Studies, 1999
 Buku Teks SO
Global change and challenge : geography for the 1990s
edited by Robert Bennet and Robert Estall
Routledge, 1991
 Buku Teks SO
Toynbee, Arnold J.
Change and habit : the challenge of our tim
Oxford University Press, 1966
 Buku Teks SO
The Challenge to systems analysis: public policy and social change
edited by Grace J. Kelleher
John Wiley & Sons, 1970
 Buku Teks SO