@book { GrnerTeeZubereitungHeilwirkungRezepte,
    title = "Grüner Tee - Zubereitung, Heilwirkung, Rezepte",
    author = "Ingrid {Pfendtner}",
    year = "2015",
    publisher = "Open Publishing",
    address = "München, Deutschland",
    url = "https://books.openpublishing.com/document/288855"
}