APA (7th ed.) Citation

Gay, P., & Time-Life Books. (1971). Age of enlightenment. Time-Life International.

Chicago Style (17th ed.) Citation

Gay, Peter, and Time-Life Books. Age of Enlightenment. Nederland, N.V: Time-Life International, 1971.

MLA (9th ed.) Citation

Gay, Peter, and Time-Life Books. Age of Enlightenment. Time-Life International, 1971.