Kirk, D. (1975). Biology today (2nd ed.). CRM.
Lua i Stíl Chicago (17ú heag.)Kirk, David. Biology Today. 2nd ed. [Del Mar, Calif.]: CRM, 1975.
Lua MLA (9ú heag.)Kirk, David. Biology Today. 2nd ed. CRM, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.