Knippenberg, Hans "The Changing Religious Landscape of Europe" edited by Knippenberg published by Het Spinhuis, Amsterdam 2005 ISBN 90-5589-248-3, page 92
According to figures compiled by the South Korean [[National Statistical Office (South Korea)|]]. 인구,가구/시도별 종교인구/시도별 종교인구 (2005년 인구총조사). NSO online KOSIS database. [2006-08-23]. (原始內容存檔於2006年9月8日).