Somerville, R. (1990, April 15). Papacy, councils, and canon law in the 11th-12th centuries. Variorum collected studies series.
Παραπομπή σε μορφή Chicago (17η εκδ.)Somerville, Robert. "Papacy, Councils, and Canon Law in the 11th-12th Centuries." Variorum Collected Studies Series 15 Apr. 1990.
Παραπομπή σε μορφή MLA (9th εκδ.)Somerville, Robert. "Papacy, Councils, and Canon Law in the 11th-12th Centuries." Variorum Collected Studies Series, 15 Apr. 1990.
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