Spellerberg, I. F. (1991). Monitoring ecological change. Cambridge University Press.
Cita Chicago (17th ed.)Spellerberg, Ian F. Monitoring Ecological Change. Cambridge: Cambridge University Press, 1991.
Cita MLA (9th ed.)Spellerberg, Ian F. Monitoring Ecological Change. Cambridge University Press, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.