Aamodt, M. G. (2011). Industrial and Organizational Psychology. Pasig City, Philippines: Cengage Learning Asia Pte Ltd.
Aquino, G. V. (1985). Educational administration (Theory and Practice). Philippines: Rex Bookstore.
Gropello, E. D., Tan, H. W., & Tandon, P. (2010). Skills for the Labor Market in the Philippines. The World Bank Publications.
Hechanova, M. R., & Franco, E. P. (2005). The Way We Work: Research and Best Practices in Philippine Organizations. Manila, Philippines: Ateneo De Manila Press.
Sison, P. S. (1991). Personnel and Human Resources Management. Quezon City, Philippines: Rex Printing Company, Inc.
FOREIGN Literatures
Fuller, C., & Taylor, P. (2008). A toolkit of motivational skills : encouraging and supporting change in individuals (2nd ed.). Chichester, England: Wiley.
Herzberg, F., Mausner, B., & Snyderman, B. B. (2009). The Motivation to Work. Brunswick, New Jersey: Transaction Publishers.
Ivancevich, J. M., Konopaske, R., & Matteson, M. T. (2011). Organizational behavior and management (9th ed.). New York: McGraw-Hill/Irwin.
Lunenburg, F. C., & Ornstein, A. C. (2008,2004). Educational Administration: Concepts and Practices (5th ed.). United States of America: Thomson Brooks/Cole .
Newstrom, J. W. (2007). Organizational behavior : human behavior at work (12th ed.). Singapore: McGraw Hill Education (Asia).
STUDIES
Employee Motivation: Theory and practice. (2012). Retrieved December 7, 2012, from Accel: http://www.accel-team.com/motivation/ frederick herzberg motivational theory. (2001-2010). (Alan Chapman) Retrieved December 4, 2012, from businessballs: http://www.businessballs.com/herzberg.htm
Herzberg's Motivators and Hygiene Factors. (2012). (Mind Tools Ltd.) Retrieved December 4, 2012, from Mind Tools: http://www.mindtools.com/pages/article/newTMM_74.htm
Longo, R. (2011, October 21). Motivation - The present and future challenge of call centres. ( Ziff Davis, Inc ) Retrieved