Somerville, R. (1990, April 13). Papacy, councils, and canon law in the 11th-12th centuries. Variorum collected studies series.
Cita Chicago Style (17a ed.)Somerville, Robert. "Papacy, Councils, and Canon Law in the 11th-12th Centuries." Variorum Collected Studies Series 13 Apr. 1990.
Cita MLA (9a ed.)Somerville, Robert. "Papacy, Councils, and Canon Law in the 11th-12th Centuries." Variorum Collected Studies Series, 13 Apr. 1990.
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