Gail, M. (1972). The three popes: An account of the great schism- when rival popes in Rome, Avignon and Pisa vied for the rule of christendom. Hale.
Chicago-Zitierstil (17. Ausg.)Gail, Marzieh. The Three Popes: An Account of the Great Schism- When Rival Popes in Rome, Avignon and Pisa Vied for the Rule of Christendom. London: Hale, 1972.
MLA-Zitierstil (9. Ausg.)Gail, Marzieh. The Three Popes: An Account of the Great Schism- When Rival Popes in Rome, Avignon and Pisa Vied for the Rule of Christendom. Hale, 1972.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.