Ercman, S. (1977). European environmental law: Legal and economic appraisal. Bubenberg-Verlag.
Chicago Style aipamenaErcman, S. European Environmental Law: Legal and Economic Appraisal. Bern: Bubenberg-Verlag, 1977.
MLA aipamenaErcman, S. European Environmental Law: Legal and Economic Appraisal. Bubenberg-Verlag, 1977.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.