@book { DieDifferenzierungdesGemeinsamen,
    title = "Die Differenzierung des Gemeinsamen",
    subtitle = "Männliche Doppelportraits in England von Hans Holbein d. J. bis Joshua Reynolds",
    author = "Marcella {Baur-Callwey}",
    year = "2007",
    publisher = "Meidenbauer",
    address = ", Germany",
    url = "https://www.peterlang.com/document/1104083"
}