Lakos, Amos, author
Westview Press, 1989
Buku Referensi
Luecke, Richard, author
[American Management Association;, ], 2010
eBooks
Bechhoefer, Bernhard G., author
Brookings Institution, 1961
Buku Teks
Marker, Jamseed, author
McFarland, 2003
Buku Teks
Cellich, Claude, author
Business Expert Press, 2012
Buku Teks