Field, Andy P, author
Sage, 2012
Buku Teks
Rasch, Dieter, author
John Wiley & Sons, 2011
Buku Teks
Kirkpatrick, Lee A., author
Wadsworth and Cengage Learning, 2011
Buku Teks
Wagner, William E., author
Pine Forge Press, 2007
Buku Teks
Wonnacott, Ronald J., author
John Wiley & Sons, 1982
Buku Teks