Rodgers, Mark, author
McGraw-Hill , 2011
Buku Teks
Ahmad Hargi Septiawan, author
Universitas Indonesia, 2013
UI - Skripsi (Membership)
Arifin Santoso, author
2001
UI - Skripsi (Membership)
Breithaupt, Tim, author
[American Management Association, ], 2003
eBooks
Hanan, Mack, author
Amacom, 2011
Buku Teks