Gaya APA

Fraenkel, J, R., Wallen, N, E. (2003). How to design and evaluate research in education (5th ed.). New York: McGraw-Hill.

Gaya MLA

Fraenkel, Jack, R.., Wallen, Norman, E.. "How to design and evaluate research in education". 5th ed. New York: McGraw-Hill, 2003. Text.