Barnum, Barbara Stevens, author
An Aspen, 1995
Buku Teks
Clancy, Tom
Berkeley Books, 1996
Buku Teks
Uris, Auren, author
McGraw-Hill , 1957
Buku Teks
Drucker, Peter F. (Peter Ferdinand), 1909-2005, author
Harper & Row, 1996
Buku Teks
edited by Gayton E. Germane
Addison-Wesley, 1986
Buku Teks