@book { RichardHageman,
    title = "Richard Hageman",
    subtitle = "The Becoming of a Song Composer",
    author = "Nico {de Villiers}",
    year = "2025",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    doi = "10.3726/b18445",
    url = "https://www.peterlang.com/document/1552283"
}