COLIN TURNER (ed.): The Koran: Critical Concepts in Islamic Studies. Volume I: Provenance and Transmission; Volume II: Themes and Doctrines; Volume III: Style and Structure; Volume IV: Translation and Exegesis . xx, 270 pp.; ix, 396 pp.; ix, 470 pp.; x, 401 pp. London and New York: RoutledgeCurzon, 2004. £525.