May, R. (2011). Why worry about how many species and their loss? Public Library of Science.
Lua i Stíl Chicago (17ú heag.)May, R. Why Worry About How Many Species and Their Loss? Public Library of Science, 2011.
Lua MLA (9ú heag.)May, R. Why Worry About How Many Species and Their Loss? Public Library of Science, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.