United States. National Park Service. Castillo de San Marcos A Guide to Castillo de San Marcos National Monument, Florida.
Chicago Style (17th ed.) CitationUnited States. National Park Service. Castillo De San Marcos A Guide to Castillo De San Marcos National Monument, Florida.
MLA (9th ed.) CitationUnited States. National Park Service. Castillo De San Marcos A Guide to Castillo De San Marcos National Monument, Florida.
Warning: These citations may not always be 100% accurate.