McNeil, John D., author
Litle Brown, 1977
Buku Teks
Taylor, Philip H., author
NFER Publishing, 1979
Buku Teks
Blumberg, Herbert H., author
Cambridge University Press , 2006
Buku Teks
edited by Helmut Greim, Robert Snyder
John Wiley & Sons, 2008
eBooks
Neal, A. Leslie
McGraw-Hill, 1971
Buku Teks