APA (7th ed.) Citation

Bea, A., O'Hara, G. P., & Leeming, B. (1963). The Unity of Christians. Herder and Herder.

Chicago Style (17th ed.) Citation

Bea, Augustin, Gerald P. O'Hara, and Bernard Leeming. The Unity of Christians. New York [etc.]: Herder and Herder, 1963.

MLA (9th ed.) Citation

Bea, Augustin, et al. The Unity of Christians. Herder and Herder, 1963.