Gaya APA

Fraenkel, J, R., Wallen, N, E. (1990). How to Design and Evaluate Research in Education . United States of America: McGraw-Hill.

Gaya MLA

Fraenkel, Jack, R.., Wallen, Norman, E.. "How to Design and Evaluate Research in Education". United States of America: McGraw-Hill, 1990. Text.