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References
- ↑ Goodman, Anthony; Morgan, David (1985-01-01). "The Yorkist claim to the throne of Castile". Journal of Medieval History. 11 (1): 61–69. doi:10.1016/S0304-4181(85)80004-X. ISSN 0304-4181.
- ↑ Huffman, Joseph P. (2018-05-03), "John of Gaunt (1340-99)", The Encyclopedia of Diplomacy, Oxford, UK: John Wiley & Sons, Ltd, pp. 1–3, doi:10.1002/9781118885154.dipl0434, ISBN 9781118887912 , retrieved 2022-03-21
- ↑ Stipulations of the treaty, recorded by Pedro López de Ayala in his Crónicas de los reyes de Castilla (in Spanish).
- ↑ Payment letter by John I to the Duke of Lancaster, in the "Colección de documentos inéditos para la historia de España", vol. LI, pp. 39 - 46 (in Spanish).