APA (7th ed.) Citation

Schaff, P. (1987). The principle of Protestantism ; What is church history? Garland Pub..

Chicago Style (17th ed.) Citation

Schaff, Philip. The Principle of Protestantism ; What Is Church History? New York: Garland Pub., 1987.

MLA (8th ed.) Citation

Schaff, Philip. The Principle of Protestantism ; What Is Church History? Garland Pub., 1987.

Warning: These citations may not always be 100% accurate.