Steckle, Lynde C
Harper & Row , 1958
Buku Teks
The Free Press, 1985
Buku Teks
Marshall, Leon Carroll
Chicago, Ill, The University of Chicago Press
Buku Teks
New York, N.Y., National Foreman's Institute.Inc
Buku Teks
Fendy Suhariadi, author
Airlangga University Press, 2013
Buku Teks