Não informado. (1970). Current sweden: Environment planning and conservation. Swedish Institute.
Chicago-referens (17:e uppl.)Não informado. Current Sweden: Environment Planning and Conservation. Stockholm: Swedish Institute, 1970.
MLA-referens (8:e uppl.)Não informado. Current Sweden: Environment Planning and Conservation. Swedish Institute, 1970.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.