@book { RichardHageman,
    title = "Richard Hageman",
    author = "Nico {de Villiers} and Kathryn {Kalinak} and Asing {Walthaus}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    doi = "10.3726/b17449",
    url = "https://www.peterlang.com/document/1056954"
}