Cita APA (7th ed.)
Leypoldt, M. M. (1967). 40 ways to teach in groups. Judson Press.
Cita Chicago (17th ed.)
Leypoldt, Martha M. 40 Ways to Teach in Groups. Valley Forge: Judson Press, 1967.
Cita MLA (9th ed.)
Leypoldt, Martha M. 40 Ways to Teach in Groups. Judson Press, 1967.
Atenció: Aquestes cites poden no estar 100% correctes.