Zimmermann, R. C. (1982). Environmental impact of forestry: Guidelines for its assessment in developing countries. Food and Agriculture Organization of the United Nations.
Lua i Stíl Chicago (17ú heag.)Zimmermann, Robert C. Environmental Impact of Forestry: Guidelines for Its Assessment in Developing Countries. Rome: Food and Agriculture Organization of the United Nations, 1982.
Lua MLA (9ú heag.)Zimmermann, Robert C. Environmental Impact of Forestry: Guidelines for Its Assessment in Developing Countries. Food and Agriculture Organization of the United Nations, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.