@book { Finanzplanfinanzierungen,
    title = "Finanzplanfinanzierungen",
    subtitle = "Materielles Eigenkapital in der GmbH",
    author = "Oliver {Habighorst}",
    year = "2006",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1101668"
}