APA (7th ed.) Citation

Petrus Kardinal, H., & Waitz, G. (1841). Vita Romualdi.

Chicago Style (17th ed.) Citation

Petrus Kardinal, Heiliger, and Georg Waitz. Vita Romualdi. 1841.

MLA (9th ed.) Citation

Petrus Kardinal, Heiliger, and Georg Waitz. Vita Romualdi. 1841.

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