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. - Ladewig Petersen, E. (Historisk Tidsskrift, 1980)