Onwuegbuzie, Anthony, author
SAGE, 2016
Buku Teks
Price, Michael, author
FSC, 2011
Buku Teks
Fricker, Jon D., author
Pearson/Prentice Hall, 2004
Buku Teks
Steine, Naomi, 1966- , author
American Management Association, 2009
eBooks
Machi, Lawrence A., author
Sage, 2016
Buku Teks