Grzegorz I (hrabia Tusculum) (Polish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Grzegorz I (hrabia Tusculum)" in Polish language version.

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783^rd place

1web.archive.org

1^st place

1^st place

archive.org

Ferdinand Gregorovius: History of the City of Rome in the Middle Ages. T. IV. Londyn: George Bell & Sons, 1896, s. 9–11. (ang.).
Ferdinand Gregorovius: History of the City of Rome in the Middle Ages. T. III. Londyn: George Bell & Sons, 1895, s. 490–491. (ang.).

fmg.ac

Conti di Tusculo: Gregorius I. Foundation for Medieval Genealogy. [dostęp 2012-11-18]. (ang.).

web.archive.org

Lindsay Brook: Popes and pornocrats in the early middle ages – 23. Gregorius I. Foundation for Medieval Genealogy, 2003. s. 13. [dostęp 2012-11-19]. (ang.).