İslâm ansiklopedisi : islām âlemi coǧrafya, etnoğrafya ve biyografya lûgati - Houtsma, M. Th. (Martijn Theodoor), 1851-1943 (Maarif Matbaası, 1940)
Issued in fascicles, issued also in bound volumes.
Revised and enlarged edition of the Encyclopaedia of Islam (published in Leiden, 1913-1938) prepared by a committee at Istanbul Üniversitesi Edebiyat Fakültesi.