Fraenkel, J. R. (2000). How to design and evaluate research in education (4th ed.). McGraw- Hill.
Cita Chicago (17th ed.)Fraenkel, Jack R. How to Design and Evaluate Research in Education. 4th ed. New York: McGraw- Hill, 2000.
Cita MLA (9th ed.)Fraenkel, Jack R. How to Design and Evaluate Research in Education. 4th ed. McGraw- Hill, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.