Spellerberg, I. F. (1991). Monitoring ecological change. Cambridge University Press.
Chicago Style (17th ed.) ZitazioaSpellerberg, Ian F. Monitoring Ecological Change. Cambridge: Cambridge University Press, 1991.
MLA (9th ed.) ZitazioaSpellerberg, Ian F. Monitoring Ecological Change. Cambridge University Press, 1991.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.