APA (7th ed.) Citation

Frothingham, A. L. (1913). Who Built the Arch of Constantine?

Chicago Style (17th ed.) Citation

Frothingham, Arthur Lincoln. Who Built the Arch of Constantine? 1913.

MLA (9th ed.) Citation

Frothingham, Arthur Lincoln. Who Built the Arch of Constantine? 1913.

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