@book { DefiningSpecies,
    title = "Defining Species",
    subtitle = "A Sourcebook from Antiquity to Today",
    author = "John S. {Wilkins}",
    year = "2009",
    publisher = "Peter Lang Verlag",
    address = "New York, Vereinigte Staaten von Amerika",
    url = "https://www.peterlang.com/document/1106113"
}