Gaya APA

Fraenkel, J, R., Wallen, N, E. (2000). How to design and evaluate research in education (Ed. VII). Boston: Mc Graw-Hill.

Gaya MLA

Fraenkel, Jack, R.., Wallen, Norman, E.. "How to design and evaluate research in education". Ed. VII Boston: Mc Graw-Hill, 2000. Text.