Robert de Clifford, I barón de Clifford (Spanish Wikipedia)
Analysis of information sources in references of the Wikipedia article "Robert de Clifford, I barón de Clifford" in Spanish language version.
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books.google.com
- Notes and Queries, Oxford University Press, 15 de marzo de 1862, p. 220.
oxforddnb.com
- Summerson, Henry.Clifford, Robert, first Lord Clifford | (1274–1314). Oxford Dictionary of National Biography. Consultado el 31 de marzo de 2021.
theheraldrysociety.com
- «The Siege of Caerlaverock». The Heraldry Society. Consultado el 31 de marzo de 2021.
wikipedia.org
en.wikipedia.org
«Clifford, Robert de». Dictionary of National Biography (en inglés). Londres: Smith, Elder & Co. 1885–1900. OCLC 2763972.
worldcat.org
- «Clifford, Robert de». Dictionary of National Biography (en inglés). Londres: Smith, Elder & Co. 1885–1900. OCLC 2763972.