Cita APA (7th ed.)
Ohlsen, M. M. (1959). Modern methods in elementary education.
Cita Chicago (17th ed.)
Ohlsen, Merle M. Modern Methods in Elementary Education. 1959.
Cita MLA (9th ed.)
Ohlsen, Merle M. Modern Methods in Elementary Education. 1959.
Atenció: Aquestes cites poden no estar 100% correctes.