Agel, J.
, & Glanze, W. D. (1987). Pearls of wisdom: A harvest of quotations from all ages. New York: HarperPerennial.
2.
Dooley, C. R.
(1945). The Training Within Industry report 1940-1945. Washington, DC: War Manpower Commission Bureau of Training, Training Within Industry Service.
3.
Ruona, W. E. A.
, & Rusaw, A. C. (2001). The role of codes of ethics in the future of human resource development. In O. Aliaga (Ed.), Proceedings of the 2001 Academy of Human Resource Development Annual Conference (pp. 221-228). Baton Rouge, LA: Academy of Human Resource Development.
4.
Steinmetz, C. S.
(1976). The history of training. In R. L. Craig (Ed.), Training and development handbook (2nd ed., pp. 1-3–1-14). New York: McGraw-Hill.
5.
Swanson, R. A.
, & Torraco, R. J. (1995). The history of technical training. In L. Kelly (Ed.), The ASTD technical and skills training handbook (pp. 1-47). New York: McGraw-Hill.