Não informado. (1981). Mountain Research and Development. United Nations University.
Chicagoスタイル(17版)引用形式Não informado. Mountain Research and Development. Boulder, Colo: United Nations University, 1981.
MLA(8版)引用形式Não informado. Mountain Research and Development. United Nations University, 1981.
警告: この引用は必ずしも正確ではありません.