@book { KundenpotentialanalyseimKundenstammvonUnternehmen,
    title = "Kundenpotentialanalyse im Kundenstamm von Unternehmen",
    author = "Bernhard {Schulz}",
    year = "1995",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1115861"
}