@book { DerPianoGradingTestinderKlavierpdagogikChinas,
    title = "Der «Piano Grading Test» in der Klavierpädagogik Chinas",
    author = "Yanjun {Zhang}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-01658-1",
    url = "https://www.peterlang.com/document/1047134"
}