@Book{OL30534234M,
    title: {Schmackhaftes aus der Harzer Küche},
    author: {Ursula Eckhard-Pietzner},
    publisher: {Heiber},
    year: {2004},
}

@Book{OL37923637M,
    title: {Original schwäbisch backen},
    author: {Monika Graff},
    publisher: {Hädecke},
    year: {2010},
    place: {Weil der Stadt},
}

@Book{OL30534145M,
    title: {Die alte Harzküche},
    author: {Reiner Langwald},
    publisher: {epubli},
    year: {2018},
    place: {Berlin},
}

@Book{OL26630519M,
    title: {Unsere Harz‑Küche},
    author: {Reiner Langwald},
    publisher: {Europäischer Hochschulverlag},
    year: {2010},
    place: {Bremen},
}

@Author{OL7442763A,
    name: {Reiner Langwald},
}