APA (7th ed.) Citation

Fabricius, J. A. (1858). Guido Viennensis: Calixtus II.

Chicago Style (17th ed.) Citation

Fabricius, Johann Albert. Guido Viennensis: Calixtus II. 1858.

MLA (9th ed.) Citation

Fabricius, Johann Albert. Guido Viennensis: Calixtus II. 1858.

Warning: These citations may not always be 100% accurate.