Robson 2007, p. 328. Robson, Michael (2007). "Queen Isabella (c.1295/1358) and the Greyfriars: An example of royal patronage based on her accounts for 1357/1358". Franciscan Studies. 65. Franciscan Institute Publications: 325–348. doi:10.1353/frc.2007.0006. S2CID201794690.
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Robson 2007, p. 328. Robson, Michael (2007). "Queen Isabella (c.1295/1358) and the Greyfriars: An example of royal patronage based on her accounts for 1357/1358". Franciscan Studies. 65. Franciscan Institute Publications: 325–348. doi:10.1353/frc.2007.0006. S2CID201794690.