APA (7th ed.) Citation

Gay, J., & Hastings, M. (1964). London observed. John Day Co..

Chicago Style (17th ed.) Citation

Gay, John, and Macdonald Hastings. London Observed. New York: John Day Co., 1964.

MLA (9th ed.) Citation

Gay, John, and Macdonald Hastings. London Observed. John Day Co., 1964.