@book { MultichannelMarketing,
    title = "Multichannel Marketing",
    author = "Ivica {Coric}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832484248",
    url = "https://m.diplom.de/document/223612"
}