Denton, P. (1996). world wide fund for nature. Orient Longman.
Lua i Stíl Chicago (17ú heag.)Denton, Peter. World Wide Fund for Nature. Hyderabad: Orient Longman, 1996.
Lua MLA (9ú heag.)Denton, Peter. World Wide Fund for Nature. Orient Longman, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.