"Veneration of saints is a universal phenomenon. All monotheistic and polytheistic creeds contain something of its religious dimension... " Issachar Ben-Ami (1998). Saint Veneration Among the Jews in Morocco. Wayne State University Press. p. 13. ISBN978-0-8143-2198-0. Retrieved 7 September 2012.
Werner Stark (1966). Sociology of Religion. Taylor & Francis. p. 367. GGKEY:ZSKE259PDZ9. Retrieved 7 September 2012.