Não informado. (2020). Progress Report. Pennsylvania State University, Agricultural Experiment Station.
Lua i Stíl Chicago (17ú heag.)Não informado. Progress Report. University Park, Pa: Pennsylvania State University, Agricultural Experiment Station, 2020.
Lua MLA (8ú heag.)Não informado. Progress Report. Pennsylvania State University, Agricultural Experiment Station, 2020.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.