@book { Pubertt,
    title = "Pubertät",
    subtitle = "Der Ratgeber für Eltern. Mit 10 goldenen Regeln durch alle Phasen",
    author = "Angela {Kling} and Eckhard {Spethmann}",
    year = "2016",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403328"
}