APA (7th ed.) Citation

Coppa, F. J. (2011). Pius IX. The encyclopedia of Christianity online. doi:10.1163/2211-2685_eco_P.105

Chicago Style (17th ed.) Citation

Coppa, Frank J. "Pius IX." The Encyclopedia of Christianity Online 2011, https://doi.org/10.1163/2211-2685_eco_P.105.

MLA (9th ed.) Citation

Coppa, Frank J. "Pius IX." The Encyclopedia of Christianity Online, 2011, https://doi.org/10.1163/2211-2685_eco_P.105.

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