Harvard Business School Press, 2004
Buku Teks
Thomson, Arthur A., author
McGraw-Hill, 2006
Buku Teks
Strand, Ray, author
Advantage Quest Publications, 2009
Buku Teks
Eitington, Julius E.
Gulf Pub. Co., 1984
Buku Teks
Welch, Jack, author
Harper Business, 2005
Buku Teks