Salkind, Neil J., author
Sage, 2000
Buku Teks
Salkind, Neil J., author
Sage Publications, 2004
Buku Teks
Wonnacott, Thomas H., 1935-, author
John Wiley & Sons, 1990
Buku Teks
Mann, Prem S, author
Jon Wiley & Sons, 2011
Buku Teks
Godfrey, M.G., author
Edward Arnold , 1986
Buku Teks