Hans M Gregersen. (1990). FAO forestry paper N.96: Planning and managing forestry research: guidelines for managers. Rome: FAO.
Chicago Style aipamenaHans M Gregersen. FAO Forestry Paper N.96: Planning and Managing Forestry Research: Guidelines for Managers. Rome: FAO, 1990.
MLA aipamenaHans M Gregersen. FAO Forestry Paper N.96: Planning and Managing Forestry Research: Guidelines for Managers. Rome: FAO, 1990.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.