Tohutoro APA (7th ed.)
Gregorius IX., P. (1506). Decretalium libellus.
Tohutoru Kātū Chicago (17th ed.)
Gregorius IX., Papa. Decretalium Libellus. Lugduni, 1506.
Tohutoro MLA (9th ed.)
Gregorius IX., Papa. Decretalium Libellus. 1506.
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