APA (7th ed.) Citation

Tillich, P., & Sturm, E. (2016). Advanced problems in systematic theology: Courses at Union Theological Seminary, New York, 1936-1938. De Gruyter.

Chicago Style (17th ed.) Citation

Tillich, Paul, and Erdmann Sturm. Advanced Problems in Systematic Theology: Courses at Union Theological Seminary, New York, 1936-1938. Berlin [etc.]: De Gruyter, 2016.

MLA (9th ed.) Citation

Tillich, Paul, and Erdmann Sturm. Advanced Problems in Systematic Theology: Courses at Union Theological Seminary, New York, 1936-1938. De Gruyter, 2016.