APA (7th ed.) Citation

Mackay, J. A. (1941). A preface to christian theology. Macmillan.

Chicago Style (17th ed.) Citation

Mackay, John A. A Preface to Christian Theology. New York: Macmillan, 1941.

MLA (9th ed.) Citation

Mackay, John A. A Preface to Christian Theology. Macmillan, 1941.