APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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