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"Religion". Puerto Rico: A Guide to the Island of Boriquén. Federal Writers Project. 1940. Archived from the original on October 10, 1999. Retrieved March 6, 2006.
Blackburn Moreno, Ronald (February 2001). "Brief Chronology of Puerto Rico"(PDF). ASPIRA Association, Inc. Archived from the original(PDF) on February 17, 2006. Retrieved February 11, 2006.
Rosado, Marisa (September 12, 2014). "The Ponce Massacre (1937)". Puerto Rico Encyclopedia. Fundacion Puertorriqueña De Las Humanidades. Archived from the original on March 4, 2016. Retrieved November 20, 2016.
"Agriculture". Puerto Rico: A Guide to the Island of Boriquén. Federal Writers Project. 1940. Archived from the original on February 14, 2006. Retrieved March 6, 2006.
"Industry, Commerce, and Labor". Puerto Rico: A Guide to the Island of Boriquén. Federal Writers Project. 1940. Archived from the original on October 10, 1999. Retrieved March 6, 2006.
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Villanueva, Victor (2009). "Colonial Memory and the Crime of Rhetoric: Pedro Albizu Campo". College English. 71 (6): 630–638. doi:10.58680/ce20097172. ISSN0010-0994.