Picó, R. The geographic regions of Puerto Rico.
Lua i Stíl Chicago (17ú heag.)Picó, Rafael. The Geographic Regions of Puerto Rico.
Lua MLA (8ú heag.)Picó, Rafael. The Geographic Regions of Puerto Rico.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.