Drummond, Helga, author
John Wiley & Sons, 2001
Buku Teks
Schroeder, Roger G., author
McGraw-Hill, 1993
Buku Teks
Albert, Henry H., author
John Wiley & Sons, 1961
Buku Teks
Schroede, Roger G
McGraw-Hill Book, 1985
Buku Teks
Simon, Herbert A., author
Macmillan, 1955
Buku Teks