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