Arnold, T. (1991). Natural history from A to Z: A terrestrial sampler. M.K. McElderry Books ; Maxwell Macmillan Canada ; Maxwell Macmillan International.
Lua i Stíl Chicago (17ú heag.)Arnold, Tim. Natural History from A to Z: A Terrestrial Sampler. New York : Toronto : New York: M.K. McElderry Books ; Maxwell Macmillan Canada ; Maxwell Macmillan International, 1991.
Lua MLA (8ú heag.)Arnold, Tim. Natural History from A to Z: A Terrestrial Sampler. M.K. McElderry Books ; Maxwell Macmillan Canada ; Maxwell Macmillan International, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.