APA (7th ed.) Citation

Wittkower, R. (1973). Architectural principles in the age of humanism (4th ed.). Academy.

Chicago Style (17th ed.) Citation

Wittkower, Rudolf. Architectural Principles in the Age of Humanism. 4th ed. London: Academy, 1973.

MLA (9th ed.) Citation

Wittkower, Rudolf. Architectural Principles in the Age of Humanism. 4th ed. Academy, 1973.

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