This primary source comes from the Records of the Central Intelligence Agency.
Full Citation: Distribution of Islam Throughout the World; 4/1946; Published Maps, 1947 - 2015; Records of the Central Intelligence Agency, Record Group 263; National Archives at College Park, College Park, MD. [Online Version, https://www.docsteach.org/documents/document/distribution-of-islam-throughout-the-world, May 8, 2024]