@book { PartnerwahlundintimeFreundschaftenimJugendalter,
    title = "Partnerwahl und intime Freundschaften im Jugendalter",
    author = "Ralf {Osthoff}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1096348"
}