APA (7th ed.) Citation

Casella, A. (2001). 21 + 26. Olschki.

Chicago Style (17th ed.) Citation

Casella, Alfredo. 21 + 26. Firenze: Olschki, 2001.

MLA (9th ed.) Citation

Casella, Alfredo. 21 + 26. Olschki, 2001.

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