(1998). Valuing the global environment: Actions & investments for a 21st century. Global Environment Facility.
Lua i Stíl Chicago (17ú heag.)Valuing the Global Environment: Actions & Investments for a 21st Century. Washington, D.C.: Global Environment Facility, 1998.
Lua MLA (8ú heag.)Valuing the Global Environment: Actions & Investments for a 21st Century. Global Environment Facility, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.