APA (7th ed.) Citation

Dilcher, H. (2010). Gregor IX., Papst (1227–1241). Theologische Realenzyklopädie, 14, . doi:10.1515/tre.14_152_21

Chicago Style (17th ed.) Citation

Dilcher, Hermann. "Gregor IX., Papst (1227–1241)." Theologische Realenzyklopädie 14 (2010), https://doi.org/10.1515/tre.14_152_21.

MLA (9th ed.) Citation

Dilcher, Hermann. "Gregor IX., Papst (1227–1241)." Theologische Realenzyklopädie, vol. 14, 2010, https://doi.org/10.1515/tre.14_152_21.

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