Thomas, R. M. (1955). Ways of teaching in elementary schools. Longmans.
Cita Chicago (17th ed.)Thomas, Robert Murray. Ways of Teaching in Elementary Schools. New York: Longmans, 1955.
Cita MLA (9th ed.)Thomas, Robert Murray. Ways of Teaching in Elementary Schools. Longmans, 1955.
Atenció: Aquestes cites poden no estar 100% correctes.