Nam-Lin Hur, Death and social order in Tokugawa Japan: Buddhism, anti-Christianity, and the danka system, Harvard University Asia Center, 2007; pp. 1-30 (The Rise of Funerary Buddhism in Tokugawa Japan). Internet archive
Jason Ānanda Josephson, When Buddhism Became a “Religion”, Japanese Journal of Religious Studies 33 (1), 143-168, 2006. Internet archive