David, B. R., & Paulino, R. R. The Pagsanjan Falls destination life cycle: An evaluation of its tourism industry.
Lua i Stíl Chicago (17ú heag.)David, Baby Regina, agus Rosell R. Paulino. The Pagsanjan Falls Destination Life Cycle: An Evaluation of Its Tourism Industry. 1999.
Lua MLA (9ú heag.)David, Baby Regina, agus Rosell R. Paulino. The Pagsanjan Falls Destination Life Cycle: An Evaluation of Its Tourism Industry.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.