APA (7th ed.) Citation

Nielen, J. M., & Cummins, P. (1941). The earliest Christian liturgy. B. Herder Book.

Chicago Style (17th ed.) Citation

Nielen, Josef Maria, and Patrick Cummins. The Earliest Christian Liturgy. St Louis, Mo: B. Herder Book, 1941.

MLA (9th ed.) Citation

Nielen, Josef Maria, and Patrick Cummins. The Earliest Christian Liturgy. B. Herder Book, 1941.