Kurt Finsterbusch, editor
McGraw-Hill, 2007
Buku Teks
Farley, John E., author
Prentice-Hall, 1992
Buku Teks
Fulcher, James, author
Oxford University Press, 2007
Buku Teks
Lapiere, Richard T., author
McGraw-Hill, 1946
Buku Teks
edited by Kenneth Thomson and Jeremy Tunstall
Penguin Books, 1983
Buku Teks