APA (7th ed.) Citation

(1971). The World of Learning 1970-71 (21st ed.). Europa.

Chicago Style (17th ed.) Citation

The World of Learning 1970-71. 21st ed. London: Europa, 1971.

MLA (9th ed.) Citation

The World of Learning 1970-71. 21st ed. Europa, 1971.

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