@book { LernprozesseamComputer,
    title = "Lernprozesse am Computer",
    subtitle = "Theoretische und empirische Annäherungen",
    author = "Patrick {Sunnen}",
    year = "2006",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1100951"
}