The best of Ralp Waldo Emerson: essays, Poems, addresses
edited by Gordon S. Haight
Classics Club by Walter J. Black, 1941
 Buku Teks
Challenge and change in the information society
edited by Susan Hornby, Zoe Clarke
Facet, 2004
 Buku Teks
Stewart, Valerie
Change : the challenge for management
McGraw-Hill, 1983
 Buku Teks
Indonesia : the challenge of change
edited by Richard W. Baker [and others]
Institute of Southeast Asian Studies, 1999
 Buku Teks
Congress presidential addresses from the silver to the golden jubilee
G. A. Natesam & Co., publishers, 1934
 Buku Teks