APA (7th ed.) Zitazioa
Leypoldt, M. M. (1967). 40 ways to teach in groups. Judson Press.
Chicago Style (17th ed.) Zitazioa
Leypoldt, Martha M. 40 Ways to Teach in Groups. Valley Forge: Judson Press, 1967.
MLA (9th ed.) Zitazioa
Leypoldt, Martha M. 40 Ways to Teach in Groups. Judson Press, 1967.
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