Stroll, M. (1980). Calixtus the second Calixtus II: A reinterpretation of his election and the end of the investiture contest.
Chicago-Zitierstil (17. Ausg.)Stroll, Mary. Calixtus the Second Calixtus II: A Reinterpretation of His Election and the End of the Investiture Contest. Lubbock, Tex, 1980.
MLA-Zitierstil (9. Ausg.)Stroll, Mary. Calixtus the Second Calixtus II: A Reinterpretation of His Election and the End of the Investiture Contest. 1980.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.