Pérez de Novoa, Lidia Georgina (2019). Interludio y Otros Versos [Interlude and Other Verses] (in Spanish). Liber Factory coedición Lord Byron. p. 71. ISBN9788417707415. Retrieved 6 July 2023.
Lemus, Jorge E. (September 2016). "La Palabra Pupusa no es Pipil" [The Word Pupusa is Not Pipil] (in Spanish). Don Bosco University. pp. 1–5. Retrieved 6 July 2023.
"La Guerra de las Pupusas". losangeles.univision.com. 27 July 2011. Archived from the original on 16 July 2015.{{cite web}}: CS1 maint: bot: original URL status unknown (link)