Cita APA

Fraenkel, J. R., & Wallen, N. E. (1993). How to Design and Evaluate Research. Singapore: McGraw-Hill.

Chicago Style Citation

Fraenkel, Jack R., i Norman E. Wallen. How to Design and Evaluate Research. Singapore: McGraw-Hill, 1993.

Cita MLA

Fraenkel, Jack R., i Norman E. Wallen. How to Design and Evaluate Research. Singapore: McGraw-Hill, 1993.