Schaff, P. (1987). The principle of Protestantism: Philip Schaff. American religious thought of the eighteenth and 19th centuries.
Cita Chicago Style (17a ed.)Schaff, Philip. "The Principle of Protestantism: Philip Schaff." American Religious Thought of the Eighteenth and 19th Centuries 1987.
Cita MLA (8a ed.)Schaff, Philip. "The Principle of Protestantism: Philip Schaff." American Religious Thought of the Eighteenth and 19th Centuries, 1987.
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