Hart, Daniel W., author
Prentice Hall International, 1997
Buku Teks
Porat, Dan I
John Wiley & Sons, 1979
Buku Teks
Gothmann, William H.
Prentice-Hall, 1982
Buku Teks
Romanowitz, H. Alex, author
John Wiley & Sons, 1968
Buku Teks
Popkin, Gary S., author
Mifflin Company, 1981
Buku Teks