@book { MusikunterrichtimRckblick,
    title = "Musikunterricht im Rückblick",
    subtitle = "Eine alternative Musikdidaktik",
    author = "Hermann Josef {Wilbert}",
    year = "2010",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1106843"
}