Yin, Robert K., author
Sage , 2014
Buku Teks
Bordens, Kenneth S., author
McGraw-Hill, 2002
Buku Teks
Bordens, Kenneth S., author
McGraw-HIll, 2005
Buku Teks
Barker, Chris, author
John Wiley & Sons, 2002
Buku Teks
edited by Nicole Muller and Martin J. Ball
Wiley-Blackwell, 2013
Buku Teks