Não informado. (1970). Current sweden: Environment planning and conservation. Swedish Institute.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Current Sweden: Environment Planning and Conservation. Stockholm: Swedish Institute, 1970.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Current Sweden: Environment Planning and Conservation. Swedish Institute, 1970.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.