@book { ProfessionalsAmateursandPerformance,
    title = "Professionals, Amateurs and Performance",
    author = "David John {Day}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "Oxford, United Kingdom",
    doi = "10.3726/978-3-0353-0371-1",
    url = "https://www.peterlang.com/document/1052517"
}