International Youth Federation for Environmental Studies and Conservation & International Union for Conservation of Nature and Natural Resources (IUCN). (1971). IYF Lüneburger Heide course 1955-1969. [S.l.]: IYF.
Lua i Stíl Chicago (17ú heag.)International Youth Federation for Environmental Studies and Conservation agus International Union for Conservation of Nature and Natural Resources (IUCN). IYF Lüneburger Heide Course 1955-1969. [S.l.]: IYF, 1971.
Lua MLA (8ú heag.)International Youth Federation for Environmental Studies and Conservation agus International Union for Conservation of Nature and Natural Resources (IUCN). IYF Lüneburger Heide Course 1955-1969. [S.l.]: IYF, 1971.
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