Gaya APA

Fraenkel, J, R., Wallen, N, E. (2006). How to design and evaluate research in education ed.6 (Ed. 6). New York: McGraw-Hill.

Gaya MLA

Fraenkel, Jack, R.., Wallen, Norman, E.. "How to design and evaluate research in education ed.6". Ed. 6 New York: McGraw-Hill, 2006. Textbook.