@book { ZuTheTeachingGapBestIdeasfromtheworldsteachersforimprovingeducationintheclassroom,
    title = "Zu: The Teaching Gap - Best Ideas from the worlds teachers for improving education in the classroom",
    author = "Julia {John}",
    year = "2004",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638285896",
    url = "https://www.hausarbeiten.de/document/26169"
}