Beshara, Tony, 1948- , author
American Management Association, 2008
eBooks
Hoevemeyer, Victoria A., author
American Management Association, 2006
eBooks
Poundstone, William, author
Little, Brown, 2012
Buku Teks
Spradley, James P.
Halt, Rinehart and Winston, 1979
Buku Teks
Stewart, Charles J., author
McGraw-Hill, 2006
Buku Teks