@book { KnowledgeFactors,
    title = "Knowledge Factors",
    subtitle = "How to Animate Members of Online Communities to Create Knowledge-Relevant Content",
    author = "Felix J. {Schmitz-Justen}",
    year = "2006",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1101596"
}