APA استشهاد

Ebel, R. L. (1969). Encyclopedia of educational research (4th Ed.). Macmillan.

استشهاد بنمط شيكاغو

Ebel, Robert L. Encyclopedia of Educational Research. 4th Ed. London: Macmillan, 1969.

MLA استشهاد

Ebel, Robert L. Encyclopedia of Educational Research. 4th Ed. Macmillan, 1969.