Não informado. (1970). Current sweden: Environment planning and conservation. Swedish Institute.
Style de citation Chicago (17e éd.)Não informado. Current Sweden: Environment Planning and Conservation. Stockholm: Swedish Institute, 1970.
Style de citation MLA (8e éd.)Não informado. Current Sweden: Environment Planning and Conservation. Swedish Institute, 1970.
Attention : ces citations peuvent ne pas être correctes à 100%.