@book { TheMiddleYearsofMarriage,
    title = "The Middle Years of Marriage",
    author = "Vince {Waldron}",
    year = "2017",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    doi = "10.3726/b11282",
    url = "https://www.peterlang.com/document/1110146"
}