History of Japanese Education and Present Educational System by Hugh L. Keenleyside, A. F. ThomasJ. B. KrausMN 1:2 (1938) p. 615 → jstor.org/stable/2382690SharePrince Ito by Kengi HamadaOmurahan Kokirishitan Kenkyu Shiryo (Quellen zum Studium über die alten Christen aus der Herrschaft Omura) by R. P. Takusuke Yamaguchi