Rahadi W. Pandoyo, author
Mazola, 2015
Buku Teks
Bredow, Miriam
McGraw-Hill, 1964
Buku Teks
Pasternak, Boris, author
William Collins Sons and Co Ltd, 1978
Buku Teks
Zelicoff, Alan P., author
American Management Association;, 2008
eBooks
Bloom, Samuel W.
The Free Press, 1965
Buku Teks