Não informado. (2018). Research Circular. Pennsylvania Department of Forests and Waters.
Lua i Stíl Chicago (17ú heag.)Não informado. Research Circular. Harrisburg, Pa: Pennsylvania Department of Forests and Waters, 2018.
Lua MLA (8ú heag.)Não informado. Research Circular. Pennsylvania Department of Forests and Waters, 2018.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.