@book { howtobehappyVeilchensturmNewAdultRomance,
    title = "how to be happy: Veilchensturm (New Adult Romance)",
    author = "Kim {Leopold}",
    year = "2021",
    publisher = "Kim Leopold",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1059769"
}