@book { AnExtraPlayeronthePlayingFieldofHistory,
    title = "An Extra Player on the Playing Field of History",
    author = "John {Saul}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Bruxelles, Belgium",
    doi = "10.3726/b17839",
    url = "https://www.peterlang.com/document/1059399"
}