Fraenkel, J. R., & Wallen, N. E. (1996). How to design and evaluate research in education (Third edition.). McGraw-Hill.

Fraenkel, Jack R., and Norman E. Wallen. How to Design and Evaluate Research in Education. Third edition. New York: McGraw-Hill, 1996.

Fraenkel, Jack R., and Norman E. Wallen. How to Design and Evaluate Research in Education. Third edition. McGraw-Hill, 1996.