@book { ChallengingVoices,
    title = "Challenging Voices",
    author = "Philip {Mullen}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Oxford, United Kingdom",
    doi = "10.3726/b18617",
    url = "https://www.peterlang.com/document/1157824"
}