↑ Jones, Terry; Terry Dolan; Juliette Dor; Robert Yeager; Alan Fletcher (2006). Who Murdered Chaucer?: A Medieval Mystery. New York, NY: St. Martin's. p.40. ISBN978-0-312-33588-5.
↑ Garcia-Quismondo, Miguel Angel Marzal (2008). "Capitulo 25: Formias de Gobierno y de Vida Espiritual y Cultural". In Palenzuela, Vicente Angel Alvarez (ed.). Historia de España de la Edad Media. Editorial Ariel, S.A. pp.537–572. ISBN978-84-344-6668-5.
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