Harvard Business Review Press, 2011
Buku Teks
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2004
UI - Skripsi (Membership)
Covey, Sean, author
[publisher not identified], [date of publication no identified]
Buku Teks
Covey, Sean, author
A Fireside Book, 2004
Buku Teks
Reid, Rob, author
[American Management Association;, ], 2009
eBooks