Spitzer, Dean R., author
American Management Association, 2007
eBooks
Harden, Leland, author
[American Management Association;, ], 2011
eBooks
Deeprose, Donna, author
[American Management Association, ], 2001
eBooks
The Economist
Economist Books, 1992
Buku Referensi
Browne, Harry, author
Arlington House , 1971
Buku Teks