@book { UnderstandingForeignCorrespondence,
    title = "Understanding Foreign Correspondence",
    author = "Peter {Gross} and Gerd G. {Kopper}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    url = "https://www.peterlang.com/document/1135930"
}