@book { MediaBusinessModels,
    title = "Media Business Models",
    author = "Klaus {Zilles} and Joan {Cuenca}",
    year = "2015",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    doi = "10.3726/978-1-4539-1700-8",
    url = "https://www.peterlang.com/document/1051763"
}