Παραπομπή σε μορφή APA (7η εκδ.)

Hopper, E. (1971). Readings in the theory of educational system. Hutchinson University Library.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Hopper, Earl. Readings in the Theory of Educational System. London: Hutchinson University Library, 1971.

Παραπομπή σε μορφή MLA (8th εκδ.)

Hopper, Earl. Readings in the Theory of Educational System. Hutchinson University Library, 1971.