Citazione Stile APA (7a Edizione)

Heywood, W. (1921). A history of Pisa, eleventh and twelfth centuries. Cambridge University Press.

Citazione stile Chigago Style (17a edizione)

Heywood, William. A History of Pisa, Eleventh and Twelfth Centuries. Cambridge: Cambridge University Press, 1921.

Citatione MLA (9a ed.)

Heywood, William. A History of Pisa, Eleventh and Twelfth Centuries. Cambridge University Press, 1921.