@book { KritischeLebensereignisseBelastungoderHerausforderung, title = "Kritische Lebensereignisse: Belastung oder Herausforderung?", author = "Ann-Kathrin {Christiansen}", year = "2015", publisher = "BACHELOR + MASTER PUBLISHING", address = "Hamburg, Deutschland", url = "https://m.bachelor-master-publishing.de/document/297823" }