Não informado. (1914). Contributions from the Department of Botany. Pennsylvania State College, Department of Botany.
Lua i Stíl Chicago (17ú heag.)Não informado. Contributions from the Department of Botany. State College, Pa: Pennsylvania State College, Department of Botany, 1914.
Lua MLA (8ú heag.)Não informado. Contributions from the Department of Botany. Pennsylvania State College, Department of Botany, 1914.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.