Jabarkan Caliak Pulo dari Protestanisme dalam bahasa minangkabau

Cook, Martin L. (1991). The Open Circle: Confessional Method in Theology. Minneapolis, Minn.: Fortress Press. xiv, 130 p. N.B.: Discusses the place of Confessions of Faith in Protestant theology, especially in Lutheranism. ISBN 0-8006-2482-3