Fahlbusch, Erwin; Bromiley, Geoffrey William; Lochman, Jan Milic; Mbiti, John; Pelikan, Jaroslav; Vischer, Lukas; Barrett, David B. (2003). The Encyclopedia of Christianity: J-O. ISBN978-0-8028-2415-8. Archived from the original on 26 August 2021. Retrieved 20 April 2016.
Fahlbusch, Erwin; Bromiley, Geoffrey William; Lochman, Jan Milic; Mbiti, John; Pelikan, Jaroslav; Vischer, Lukas; Barrett, David B. (2003). The Encyclopedia of Christianity: J-O. ISBN978-0-8028-2415-8. Archived from the original on 26 August 2021. Retrieved 20 April 2016.