@book { BilligfliegerimRaumEuropaEinestrategischeAnalyse, title = "Billigflieger im Raum Europa: Eine strategische Analyse", author = "Philipp Heinrich Claudius {Fischer}", year = "2013", publisher = "BACHELOR + MASTER PUBLISHING", address = "Hamburg, Deutschland", url = "https://m.bachelor-master-publishing.de/document/296749" }