Borg, W. R., & Gall, M. D. (1983). Educational research: An introduction (4th ed.). Longman.
Cita Chicago (17th ed.)Borg, Walter R., i Meredith D. Gall. Educational Research: An Introduction. 4th ed. New York: Longman, 1983.
Cita MLA (8th ed.)Borg, Walter R., i Meredith D. Gall. Educational Research: An Introduction. 4th ed. Longman, 1983.
Atenció: Aquestes cites poden no estar 100% correctes.