LADEWIG PETERSEN, E. Julius Wellhausen: The Religo-Political Factions in Early Islam. Ed. by R. C. Ostle. North-Holland Medieval Translations (gen.ed. R. Vaughan) vol. 3. Amsterdam, Oxford, North-Holland Publishing Company 1978. xi + 183 s. D.fl. 24.00. Historisk Tidsskrift, v. 13, 1 jan. 1980.