@book { PhilipSchaff18191893,
    title = "Philip Schaff (1819-1893)",
    subtitle = "Portrait of an Immigrant Theologian",
    author = "Gary K. {Pranger}",
    year = "1997",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    url = "https://www.peterlang.com/document/1085827"
}