APA (7th ed.) Citation

Letarouilly, P. (1963). The Vatican buildings=Les Batiments du Vatican. A. Tiranti.

Chicago Style (17th ed.) Citation

Letarouilly, Paul. The Vatican Buildings=Les Batiments Du Vatican. London: A. Tiranti, 1963.

MLA (9th ed.) Citation

Letarouilly, Paul. The Vatican Buildings=Les Batiments Du Vatican. A. Tiranti, 1963.

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