Castillo San Felipe del Morro (English Wikipedia)

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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)

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nps.gov

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)
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"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.

Castillo San Felipe del Morro (English Wikipedia)

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