Não informado. (1981). Mountain Research and Development. United Nations University.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Mountain Research and Development. Boulder, Colo: United Nations University, 1981.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Mountain Research and Development. United Nations University, 1981.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.