(1993). Keanekaragaman Hayati. WWF.
Lua i Stíl Chicago (17ú heag.)Keanekaragaman Hayati. WWF, 1993.
Lua MLA (8ú heag.)Keanekaragaman Hayati. WWF, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.
Lua APA (7ú heag.)