Cita APA (7th ed.)

ENCYCLOPEDIA.. & MITZEL, H. E. (1969). Encyclopedia of educational research vol.4.-- Ed. 5. The Free Press.

Cita Chicago (17th ed.)

ENCYCLOPEDIA.. i Harold E. MITZEL. Encyclopedia of Educational Research Vol.4.-- Ed. 5. New York: The Free Press, 1969.

Cita MLA (9th ed.)

ENCYCLOPEDIA.. i Harold E. MITZEL. Encyclopedia of Educational Research Vol.4.-- Ed. 5. The Free Press, 1969.