@book { VerteidigungLeoTrotzkis, title = "Verteidigung Leo Trotzkis", subtitle = "Zweite, erweiterte Auflage", author = "David {North} and Wolfgang {Weber} and Andrea {Rietmann}", year = "2016", publisher = "MEHRING Verlag", address = "Essen, Deutschland", url = "https://mehring.openpublishing.com/document/321513" }