APA (7th ed.) Citation

Boyle, L. E. (1972). A survey of the Vatican archives and of its medieval holdings.

Chicago Style (17th ed.) Citation

Boyle, Leonard E. A Survey of the Vatican Archives and of Its Medieval Holdings. 1972.

MLA (9th ed.) Citation

Boyle, Leonard E. A Survey of the Vatican Archives and of Its Medieval Holdings. 1972.

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