@book { HappeninginEducationTheoreticalIssues,
    title = "Happening in Education – Theoretical Issues",
    author = "Martin {Blaszk}",
    year = "2019",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b11112",
    url = "https://www.peterlang.com/document/1054558"
}