McKee, P. (1951). Teacher's manual for climbing higher. The Riverside Press.
Cita Chicago (17th ed.)McKee, Paul. Teacher's Manual for Climbing Higher. Cambridge, Mass: The Riverside Press, 1951.
Cita MLA (9th ed.)McKee, Paul. Teacher's Manual for Climbing Higher. The Riverside Press, 1951.
Atenció: Aquestes cites poden no estar 100% correctes.