APA (7th ed.) Citation

Conroy, C. C. (1910). Pope Calixtus III. and Halley's comet. Los Angeles.

Chicago Style (17th ed.) Citation

Conroy, Charles C. Pope Calixtus III. and Halley's Comet. Los Angeles, 1910.

MLA (8th ed.) Citation

Conroy, Charles C. Pope Calixtus III. and Halley's Comet. Los Angeles, 1910.

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