(1976). Environmental economics. Volume 2. Methods. Martinus Nijhoff.
Chicago Style aipamenaEnvironmental Economics. Volume 2. Methods. Leiden: Martinus Nijhoff, 1976.
MLA aipamenaEnvironmental Economics. Volume 2. Methods. Martinus Nijhoff, 1976.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.