1. 1. Del Buono DJ: Verifying the nurses' knowledge of pharmacology. N «rs Outlook 20:463 July 1972.
2. 2. Cyrs TE Jr: How to design learning modules. J Prac Nun 26:30 September 1976.
3. 3. Gronlund N: Construction Afhierement Tesis. Englewood Cliffs NJ Prentice- Hall Ine 1977 p 27.