Osborne, David, author
Harvard Business School, 1990
Buku Teks
American Association for the Advancement of Science,, 1974
Buku Teks
Rosenblatt, S. Bernard, author
Houghton Mifflin, 1973
Buku Teks
Steinhoff, Dan, author
McGraw-Hill, 1979
Buku Teks
Henderson, Hazel, author
Kumarian Press, 1999
Buku Teks