Agricultural Resources & Environmental Indicators. United States Department of Agriculture.
Lua i Stíl Chicago (17ú heag.)Agricultural Resources & Environmental Indicators. United States Department of Agriculture.
Lua MLA (9ú heag.)Agricultural Resources & Environmental Indicators. United States Department of Agriculture.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.