Walsh, B. Heroes of the environment: Our annual guide to the men and women who are working to help the planet.
Chicago-referens (17:e uppl.)Walsh, Bryan. Heroes of the Environment: Our Annual Guide to the Men and Women Who Are Working to Help the Planet.
MLA-referens (9:e uppl.)Walsh, Bryan. Heroes of the Environment: Our Annual Guide to the Men and Women Who Are Working to Help the Planet.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.