@book { PositiveLeadership, title = "Positive Leadership", subtitle = "Erfolgreich führen mit PERMA-Lead: die fünf Schlüssel zur High Performance", author = "Markus {Ebner}", year = "2019", publisher = "facultas", address = "Wien, Österreich", url = "https://campus-lizenzen.facultas.at/document/461089" }