http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
the letters of Karl Barth and Carl Zuckmayer
preface by Hinrich Stoevesandt ; translated by Geoffrey W. Bromiley.
Translation of: Spate Freundschaft in Briefen.
Authors' names in reverse order in original edition 1977.