United Kingdom. Dept. of the Environment. (1989). Environment in trust. HMSO.
Chicago Style aipamenaUnited Kingdom. Dept. of the Environment. Environment in Trust. United Kingdom: HMSO, 1989.
MLA aipamenaUnited Kingdom. Dept. of the Environment. Environment in Trust. HMSO, 1989.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.