Castillo San Felipe del Morro (English Wikipedia)

"Justificación para una historia militar de Puerto Rico" (PDF). Academia Puertorriqueña de la Historia (in Spanish). April 4, 2023. pp. 250–51. Retrieved January 19, 2024.

amuraworld.com

Van Middeldyk, R.A. (1903). Brumbaugh, Martin (ed.). The History of Puerto Rico: From the Spanish Discovery to the American Occupation. D. Appleton and Company. pp. 109–110. Retrieved 6 March 2019.

Juan, Mailing Address: 501 Norzagaray Street San; Us, PR 00901 Phone: 787 729-6777 x223 San Juan NHS Headquarters Superintendent's Office Contact. "Park Components - El Morro - San Juan National Historic Site (U.S. National Park Service)". www.nps.gov. Retrieved 2024-10-23.{{cite web}}: CS1 maint: numeric names: authors list (link)
"San Juan National Historic Site (U.S. National Park Service)". www.nps.gov. Retrieved 2024-06-02.
"Old San Juan Historic District" (PDF). NPS. WBM: United States Department of the Interior. Archived from the original (PDF) on April 11, 2019. Retrieved 31 July 2019.
"San Juan National Historic Site celebrates 12th Annual Artisan's Fair at El Morro - San Juan National Historic Site". U.S. National Park Service.
"8th Annual Artisan Fair at Castillo San Felipe del Morro". San Juan National Historic Site (U.S. National Park Service). 12 June 2012. Retrieved 14 June 2020.

"Calls Odenwald affair an attack". The New York Times. 7 April 1915. p. 3. Retrieved 21 March 2024 – via Times Machine.

"Historic Light Station Information and Photography: Puerto Rico". United States Coast Guard Historian's Office. Archived from the original on 2017-05-01. Retrieved 2008-10-26.

"Old San Juan Historic District" (PDF). NPS. WBM: United States Department of the Interior. Archived from the original (PDF) on April 11, 2019. Retrieved 31 July 2019.
El Morro, San Cristobal y San Geronimo en peligro en caso de terremoto Archived January 8, 2014, at the Wayback Machine on NoticiasOnline (6/7/2009)
"Historic Light Station Information and Photography: Puerto Rico". United States Coast Guard Historian's Office. Archived from the original on 2017-05-01. Retrieved 2008-10-26.