Roberto de Courtenay (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Roberto de Courtenay" in Spanish language version.

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3^rd place

7^th place

books.google.com

Nicol, 1993, p. 12-13. Nicol, Donald M. (1993) [1972]. The Last Centuries of Byzantium, 1261-1453 (2. edición). Cambridge University Press. ISBN 9780521439916.
Nicol, 1993, p. 13. Nicol, Donald M. (1993) [1972]. The Last Centuries of Byzantium, 1261-1453 (2. edición). Cambridge University Press. ISBN 9780521439916.