APA (7th ed.) Citation

(1964). Guide to London excursions: 20th International Geographical Congress.

Chicago Style (17th ed.) Citation

Guide to London Excursions: 20th International Geographical Congress. London, 1964.

MLA (9th ed.) Citation

Guide to London Excursions: 20th International Geographical Congress. 1964.

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