APA (7th ed.) Citation

Halliwell, W. J. (1939). The style of Pope St. Leo the Great. Catholic University of America Press.

Chicago Style (17th ed.) Citation

Halliwell, William J. The Style of Pope St. Leo the Great. Washington: Catholic University of America Press, 1939.

MLA (9th ed.) Citation

Halliwell, William J. The Style of Pope St. Leo the Great. Catholic University of America Press, 1939.

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