References
Allen, W.C. (2006). Overview and evolution of the ADDIE training system. Advances in Developing Human Resources 8(4): 430-441.
Bass, E.B. (n.d.). Step 1: Problem identification and general needs assessment.
Swanson, R.A. & Holton, E.F. (2009). Training and development practices. Chapter 12 in Foundations of Human Resource Development.