APA (7th ed.) Citation

Erdos, R. F. (1967). Teaching by correspondence. Longmans, Green & Co Limted.

Chicago Style (17th ed.) Citation

Erdos, Renee F. Teaching by Correspondence. London: Longmans, Green & Co Limted, 1967.

MLA (9th ed.) Citation

Erdos, Renee F. Teaching by Correspondence. Longmans, Green & Co Limted, 1967.

Warning: These citations may not always be 100% accurate.