edited by D.J. Greenland and R. Lal
John Wiley & Sons, 1979
Buku Teks
Williamson, James A., author
Macmilan and Co,, 1950
Buku Teks
Tannenbaum, Donald G., author
Wadsworth/Thomson learning, 2004
Buku Teks
Hecht, Harry G.
Prentice-Hall, 1990
Buku Teks
Armstrong, David, 1960-, author
Macmillan, 1983
Buku Teks