APA (7th ed.) Citation

Heywood, W., & Olcott, L. (1903). Guide to Siena: History and art.

Chicago Style (17th ed.) Citation

Heywood, William, and Lucy Olcott. Guide to Siena: History and Art. Siena, 1903.

MLA (9th ed.) Citation

Heywood, William, and Lucy Olcott. Guide to Siena: History and Art. 1903.

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