Weaver, D. B. (1998). Ecotourism in the less developed world David B. Weaver. CAB International.
Lua i Stíl Chicago (17ú heag.)Weaver, David B. Ecotourism in the Less Developed World David B. Weaver. CAB International, 1998.
Lua MLA (8ú heag.)Weaver, David B. Ecotourism in the Less Developed World David B. Weaver. CAB International, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.