APA (7th ed.) Citation

Grünberg, P., & Spener, P. J. (1906). Philipp Jakob Spener Philipp Jakob Spener.

Chicago Style (17th ed.) Citation

Grünberg, Paul, and Philipp Jakob Spener. "Philipp Jakob Spener." Philipp Jakob Spener 1906.

MLA (8th ed.) Citation

Grünberg, Paul, and Philipp Jakob Spener. "Philipp Jakob Spener." Philipp Jakob Spener, 1906.

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