Prestige, G.L. God in Patristic Thought SPCK (1964) pp. 290ff; & Bettenson, Henry. The Early Christian Fathers OUP (1976) p. 286; & Brown, Colin Karl Barth and the Christian Message London:Tyndale (1967) p. 74; & Catholic Culture.org Dictionary
[https://www.prca.org/prtj/apr2000.html "The Holy Family:God As Truly Three" by David J. Engelsma in the Protestant Reformed Theological Journal, April 2000, Volume 33, Number 2. Retrieved 9 April 2021.
rccommentary2.blogspot.com
Location blog citation in "Idea of a University" chapter entitled "University Preaching"