Commire, Anne, ed. (2007). "Perez, Maria". In Dictionary of Women Worldwide: 25,000 Women through the Ages. Vol. 2: M–Z. Farmington Hills, MI: Thomson Gale. p. 1,498.
Díaz, Esther Corral (2016). "Maria Balteira, a Woman Crusader of Outremer". In Gonzáles-Paz, Carlos Andrés (ed.). Women and Pilgrimage in Medieval Galicia. Routledge: New York: pp. 65–80.
Ruiz, Joaquim Ventura (2015).
"A verdadeira cruzada de María Pérez «Balteira»". In Alvar, Carlos (ed.). Estudios de literatura medieval en la Península Ibérica. San Millán de la Cogolla: Cilengua. pp. 1,167–1,182.
Commire, Anne, ed. (2007). "Perez, Maria". In Dictionary of Women Worldwide: 25,000 Women through the Ages. Vol. 2: M–Z. Farmington Hills, MI: Thomson Gale. p. 1,498.
Díaz, Esther Corral (2016). "Maria Balteira, a Woman Crusader of Outremer". In Gonzáles-Paz, Carlos Andrés (ed.). Women and Pilgrimage in Medieval Galicia. Routledge: New York: pp. 65–80.
Ruiz, Joaquim Ventura (2015).
"A verdadeira cruzada de María Pérez «Balteira»". In Alvar, Carlos (ed.). Estudios de literatura medieval en la Península Ibérica. San Millán de la Cogolla: Cilengua. pp. 1,167–1,182.