Saeculum obscurum (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Saeculum obscurum" in English language version.

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archive.org

Dwyer, John C. (1998). Church history: twenty centuries of Catholic Christianity. Mahwah, US: Paulist Press. p. 155. ISBN 0-8091-3830-1.

doi.org

Poole, Reginald L (1917). "Papal chronology in the eleventh century". English Historical Review. 1917a41 (32): 204–214. doi:10.1093/ehr/XXXII.CXXVI.204.