Balingit, S. L. M., & Bassig, X. B. Beyond scheme: Payment for environmental services in tourism.
Lua i Stíl Chicago (17ú heag.)Balingit, Sheryl Lou M., agus Xyza B. Bassig. Beyond Scheme: Payment for Environmental Services in Tourism. 2009.
Lua MLA (9ú heag.)Balingit, Sheryl Lou M., agus Xyza B. Bassig. Beyond Scheme: Payment for Environmental Services in Tourism.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.