JOHNSON, G. B., & OBER, W. C. (2010). Essentials of the living world. Mc Graw-Hill.
Lua i Stíl Chicago (17ú heag.)JOHNSON, George B., agus William C. OBER. Essentials of the Living World. Mc Graw-Hill, 2010.
Lua MLA (9ú heag.)JOHNSON, George B., agus William C. OBER. Essentials of the Living World. Mc Graw-Hill, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.