Nasution, Arman Hakim ;  

Caroselli, Marlene;  

Evans, James R.;  

Zulauf, Carol Ann;  

Hill, Mark E. ;  

John Vogelsang; Maya Townsend; Matt Minahan; David Jamieson; Judy Vogel; Annie Viets; Cathy Royal; Lynne Valek  

Dudik, Evan M.;  

Hasson, Gilli ;  

Scales, Pat R.;  

Harvard Business Review;  

Roberto, Michael A;  

Holt, Katherine E;  

Hildebrand, David;  

Tearle, Ruth;  

Britz, Galen C.;  

Trenholm, Sarah;  

Peale, Norman Vincent;  

Tuanakotta, Theodorus M.;  

Wartana, Eka;  

Mootee, Idris ;