Freeman. Black Hills Forestry. University Press of Colorado.
Lua i Stíl Chicago (17ú heag.)Freeman. Black Hills Forestry. University Press of Colorado.
Lua MLA (9ú heag.)Freeman. Black Hills Forestry. University Press of Colorado.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.