Cita APA (7th ed.)

Servais, W., & Varga, T. (1971). Teaching school mathematics. Penguin Books.

Cita Chicago (17th ed.)

Servais, W., i T. Varga. Teaching School Mathematics. Harmondsworth: Penguin Books, 1971.

Cita MLA (9th ed.)

Servais, W., i T. Varga. Teaching School Mathematics. Penguin Books, 1971.