Johnson, L. G. Biology. Wm.C. Brown.
Lua i Stíl Chicago (17ú heag.)Johnson, Leland G. Biology. Iowa: Wm.C. Brown.
Lua MLA (9ú heag.)Johnson, Leland G. Biology. Wm.C. Brown.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.