Fortress of the Immaculate Conception (English Wikipedia)

Carlos Viscasillas (2009). "La Fortaleza de la Inmaculada Concepción de María" (PDF) (in Spanish). Managua, Nicaragua: Agencia Española de Cooperación Internacional para el Desarrollo (AECID). Archived from the original (PDF) on 2011-09-03. Retrieved 2011-04-24.

archive.org

Kirstin Olsen (1994). Chronology of women's history. Westport, Connecticut: Greenwood Press. p. 90. ISBN 0-313-28803-8. Retrieved 2011-04-23. Rafaela Herrera 1762.

"Rafaela Herrera: File#201, Record#1651 (subscription required)" (in Spanish). Guatemala City, Guatemala: Archivo General de Centroamerica. 2009. Retrieved 2011-04-24.

David F. Marley (2008). Wars of the Americas: a chronology of armed conflict in the Western Hemisphere, 1492 to the present. Vol. 1 (2nd ed.). Santa Barbara, California: ABC-CLIO, Inc. p. 441. ISBN 978-1-59884-100-8. Retrieved 2011-04-23.
Robert Edwin Peary (1889). "The Río San Juan de Nicaragua". Journal of the American Geographical Society of New York. 21: 57–86. doi:10.2307/196656. ISSN 1949-8535. JSTOR 196656. Retrieved 2011-04-23.
David Ewing Duncan (1996). "The invasion of Nicaragua". Hernando De Soto: a savage quest in the Americas. Norman, Oklahoma: University of Oklahoma Press. p. 78. ISBN 0-8061-2977-8. Retrieved 2011-04-23.
Ephraim George Squier (1852). Nicaragua: its people, scenery, monuments, and the proposed interoceanic canal. Vol. I. London: Longman, Brown, Green and Longmans. pp. 82, 106, 193. Retrieved 2011-04-23.
Ephraim George Squier (1852). Nicaragua: its people, scenery, monuments, and the proposed interoceanic canal. Vol. I. London: Longman, Brown, Green and Longmans. pp. 110–1. Retrieved 2011-04-23.

Roberto Trigueros Bada (2011). "Defensas estratégicas de la Capitanía General de Guatemala Castillos de la Inmaculada Concepción y de San Carlos" (PDF). Revista de Temas Nicaragüenses (in Spanish). 34 (February): 149–94. Archived from the original (PDF) on 2011-07-26. Retrieved 2011-04-29.

José Dolores Gámez (1889). "Segunda mitad del siglo XVIII". Historia de Nicaragua desde los tiempos prehistóricos hasta 1860 (PDF) (in Spanish) (1st ed.). Managua, Nicaragua: El País. pp. 255–256. Archived from the original (PDF) on 2011-08-12. Retrieved 2011-04-25.

Robert Edwin Peary (1889). "The Río San Juan de Nicaragua". Journal of the American Geographical Society of New York. 21: 57–86. doi:10.2307/196656. ISSN 1949-8535. JSTOR 196656. Retrieved 2011-04-23.

"Efemerides Nacionales". La Trinchera de la Noticia (in Spanish). Managua, Nicaragua: Periodistas Independientes, S.A. (PINSA). 2010-07-15. Archived from the original on 2012-03-23. Retrieved 2011-04-24.

United Nations Educational, Scientific; Cultural Organization (2011). "Fortress of the immaculate Conception". Paris: UNESCO World Heritage Centre. Retrieved 2011-04-23.

Roberto Trigueros Bada (2011). "Defensas estratégicas de la Capitanía General de Guatemala Castillos de la Inmaculada Concepción y de San Carlos" (PDF). Revista de Temas Nicaragüenses (in Spanish). 34 (February): 149–94. Archived from the original (PDF) on 2011-07-26. Retrieved 2011-04-29.
José Dolores Gámez (1889). "Segunda mitad del siglo XVIII". Historia de Nicaragua desde los tiempos prehistóricos hasta 1860 (PDF) (in Spanish) (1st ed.). Managua, Nicaragua: El País. pp. 255–256. Archived from the original (PDF) on 2011-08-12. Retrieved 2011-04-25.
"Efemerides Nacionales". La Trinchera de la Noticia (in Spanish). Managua, Nicaragua: Periodistas Independientes, S.A. (PINSA). 2010-07-15. Archived from the original on 2012-03-23. Retrieved 2011-04-24.
Carlos Viscasillas (2009). "La Fortaleza de la Inmaculada Concepción de María" (PDF) (in Spanish). Managua, Nicaragua: Agencia Española de Cooperación Internacional para el Desarrollo (AECID). Archived from the original (PDF) on 2011-09-03. Retrieved 2011-04-24.