(1892). Natural science. Macmillan & Co..
Lua i Stíl Chicago (17ú heag.)Natural Science. London: Macmillan & Co., 1892.
Lua MLA (8ú heag.)Natural Science. Macmillan & Co., 1892.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.