@bookMichels_2018, title=The Segmentation of Video-On-Demand Consumers, publisher=Universität Paderborn, author=Michels, Luisa Juliane, year=2018 

@bookZarindast_2017, title=The role of eWOM in the movie industry: The effect of online user ratings on box office sales , publisher=Universität Paderborn, author=Zarindast, Mana, year=2017