APA (7th ed.) Citation

Pius, I. (1878). Ad perpetuam rei memoriam. Theologisch-praktische Quartalschrift, 31(2), 342-348.

Chicago Style (17th ed.) Citation

Pius, IX. "Ad Perpetuam Rei Memoriam." Theologisch-praktische Quartalschrift 31, no. 2 (1878): 342-348.

MLA (9th ed.) Citation

Pius, IX. "Ad Perpetuam Rei Memoriam." Theologisch-praktische Quartalschrift, vol. 31, no. 2, 1878, pp. 342-348.

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