@book { ErfolgsfaktorGuerillaMarketing,
    title = "Erfolgsfaktor Guerilla Marketing",
    author = "Julia {Anders}",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656528838",
    url = "https://www.hausarbeiten.de/document/232660"
}