Cita APA (7a ed.)

Heywood, W., & Douglas, R. L. (1910). A History of Perugia: With twenty one illustrations. Methuen & Co..

Cita Chicago Style (17a ed.)

Heywood, William, y R. Langton Douglas. A History of Perugia: With Twenty One Illustrations. London: Methuen & Co., 1910.

Cita MLA (9a ed.)

Heywood, William, y R. Langton Douglas. A History of Perugia: With Twenty One Illustrations. Methuen & Co., 1910.