Não informado. (2019). Newsletter. Pennsylvania State University, Environmental Resources Research Institute.
Lua i Stíl Chicago (17ú heag.)Não informado. Newsletter. University Park, Pa: Pennsylvania State University, Environmental Resources Research Institute, 2019.
Lua MLA (8ú heag.)Não informado. Newsletter. Pennsylvania State University, Environmental Resources Research Institute, 2019.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.