Não informado. (1970). Current sweden: Environment planning and conservation. Swedish Institute.
Chicago-Zitierstil (17. Ausg.)Não informado. Current Sweden: Environment Planning and Conservation. Stockholm: Swedish Institute, 1970.
MLA-Zitierstil (8. Ausg.)Não informado. Current Sweden: Environment Planning and Conservation. Swedish Institute, 1970.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.