@book { LeistungstrainingfrdasPferd,
    title = "Leistungstraining für das Pferd",
    subtitle = "Biologie und Trainingsprinzipien",
    author = "Franz {Ellendorff}",
    year = "2011",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403730"
}