@book { TheBusinessofArtUnveiled,
    title = "The Business of Art Unveiled",
    subtitle = "New York Art Dealers Speak up",
    author = "Ulrike {Bielstein Klein}",
    year = "1994",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1113903"
}