@book{ BA63688095, author = "Kluge, Norbert", title = "Sexualunterricht : Beispiele, Erfahrungen, Perspektiven", publisher = "Julius Klinkhardt", year = "1976", series = "Texte zur Fachdidaktik", number = "", URL = "https://ci.nii.ac.jp/ncid/BA63688095" }