@book { MasturbationundSexualerziehunginVergangenheitundGegenwart,
    title = "Masturbation und Sexualerziehung in Vergangenheit und Gegenwart",
    author = "Karl Heinz {Bloch}",
    year = "1989",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1077143"
}