@book { MarketingimmittelstndischenSortimentsbuchhandel,
    title = "Marketing im mittelständischen Sortimentsbuchhandel",
    author = "Walter {Hueber}",
    year = "1999",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1087246"
}