Unknown. (2023). Pennsylvania department of forestry. Forest Research Institute.
Lua i Stíl Chicago (17ú heag.)Unknown. Pennsylvania Department of Forestry. Forest Research Institute, 2023.
Lua MLA (9ú heag.)Unknown. Pennsylvania Department of Forestry. Forest Research Institute, 2023.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.