Ladewig Petersen, E. (1980) “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, 130. Tilgængelig hos: https://tidsskrift.dk/historisktidsskrift/article/view/52281 (Set: 15november2019).