1 2 3 Encyclopædia Britannica: Monarchianism 1 2 3 Monarchians at Catholic Encyclopedia, newadvent.org ↑ Oxford Dictionary of the Christian Church (Oxford University Press 2005 ISBN 978-0-19-280290-3): Monarchianism ↑ Knight, Kevin (ed.), "The dogma of the Trinity", Catholic Encyclopedia, New Advent ↑ Oxford Dictionary of the Christian Church (Oxford University Press 2005 ISBN 978-0-19-280290-3): Monarchianism ↑ Tertullian.