Lua APA (7ú heag.)

Spellerberg, I. F. (1991). Monitoring ecological challenge. Cambridge University Press.

Lua i Stíl Chicago (17ú heag.)

Spellerberg, Ian F. Monitoring Ecological Challenge. New York: Cambridge University Press, 1991.

Lua MLA (9ú heag.)

Spellerberg, Ian F. Monitoring Ecological Challenge. Cambridge University Press, 1991.

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.