APA (7th ed.) Citation

Bea, A., Leeming, B., & O'hara, G. P. (1963). The unity of christians. Geoffrey Chapman.

Chicago Style (17th ed.) Citation

Bea, Augustin, Bernard Leeming, and Gerald P. O'hara. The Unity of Christians. London: Geoffrey Chapman, 1963.

MLA (9th ed.) Citation

Bea, Augustin, et al. The Unity of Christians. Geoffrey Chapman, 1963.