A Dictionary of Christian Theology, edited by Alan Richardson, 1969, page 95; The New Encyclopædia Britannica, 15th Edition, 1985, Micropædia, Volume 4, page 79.
A Dictionary of Christian Theology, toimetaja Alan Richardson, 1969, lehekülg 95; The New Encyclopædia Britannica, 15. väljaanne, 1985, Micropædia, 4. köide, lehekülg 79.