Laboratorio di Geografia Economica. University of Messina & United Nations Educational, Scientific and Cultural Organisation. (1991). Man and parks: International conference on protected areas = L'uomo e il parco : conferenza internationale sulle aree protette. University of Messina Press.
Παραπομπή σε μορφή Chicago (17η εκδ.)Laboratorio di Geografia Economica. University of Messina και Scientific and Cultural Organisation United Nations Educational. Man and Parks: International Conference on Protected Areas = L'uomo E Il Parco : Conferenza Internationale Sulle Aree Protette. Messina: University of Messina Press, 1991.
Παραπομπή σε μορφή MLA (9th εκδ.)Laboratorio di Geografia Economica. University of Messina και Scientific and Cultural Organisation United Nations Educational. Man and Parks: International Conference on Protected Areas = L'uomo E Il Parco : Conferenza Internationale Sulle Aree Protette. University of Messina Press, 1991.