Goodban, William T., author
McGraw-Hill, 1979
Buku Teks
Ching, Frank
Van Nonstrand Reinhold Company, 1975
Buku Teks
Rani, Ruzaimi Mat
Words & Visuals Press Pte Ltd, [date of publication not identified]
Buku Teks
Montague, John, author
John Wiley & Sons, 2010
Buku Teks
Helms, Michael E., author
Prentice-Hall, 1990
Buku Referensi