Columbia subject headings:
Europe--Church history--20th century--Sources.
World War, 1914-1918--Protestant churches--Europe--Sources.
Harvard subject headings:
Europe--Church history--20th century--Sources.
World War, 1914-1918--Religious aspects--Protestant churches
World War, 1914-1918--Religious aspects--Protestant churches--Sources.
Princeton subject headings:
Europe--Church history--20th century--Sources.
Protestant churches--Europe--History--20th century--Sources.
World War, 1914-1918--Religious aspects--History--Sources.