Roberts, M. B. V. (1986). Biology: A functional approach (4th ed.). Nelson.
Lua i Stíl Chicago (17ú heag.)Roberts, M. B. V. Biology: A Functional Approach. 4th ed. London: Nelson, 1986.
Lua MLA (8ú heag.)Roberts, M. B. V. Biology: A Functional Approach. 4th ed. Nelson, 1986.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.