APA (7th ed.) Zitazioa
Hopper, E. (1971). Readings in the Theory of Educational Systems. Hutchinson University.
Chicago Style (17th ed.) Zitazioa
Hopper, Earl. Readings in the Theory of Educational Systems. Londres, Inglaterra: Hutchinson University, 1971.
MLA (9th ed.) Zitazioa
Hopper, Earl. Readings in the Theory of Educational Systems. Hutchinson University, 1971.
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