APA (7th ed.) Citation

Society of the Atonement & Willebrands, J. G. M. (1963). Problems before unity. Helicon Press.

Chicago Style (17th ed.) Citation

Society of the Atonement and J. G. M. Willebrands. Problems Before Unity. Baltimore: Helicon Press, 1963.

MLA (8th ed.) Citation

Society of the Atonement and J. G. M. Willebrands. Problems Before Unity. Helicon Press, 1963.