APA ציטוט

Erdos, R. F. (1967). Teaching by correspondence. Longmans; Unesco.

Chicago Style (17th ed.) Citation

Erdos, Renée F. Teaching by Correspondence. London, Paris: Longmans; Unesco, 1967.

ציטוט MLA

Erdos, Renée F. Teaching by Correspondence. Longmans; Unesco, 1967.