Thomas, R. Roosevelt, author
American Management Association, 2006
eBooks
Hacker, Andrew , author
St. Martin's Griffin, 2011
Buku Teks
Walker, Jarrett, author
Island Press, 2012
eBooks
Adrian, Charles R., author
McGraw-Hill , 1978
Buku Teks
Sigman, Aric, author
London, 2005
Buku Teks