Conoar, Yves, M.J., Divided Christendom . London: Geoffrey Bles, 1939. A pioneer work in this field, it provides a treatment of the theological issues which later studies have not superseded.
2.
Baum, Gregory, That They May Be One. A Study of Papal Doctrine: Leo XIII— Pius XII . London: Bloomsbury Publishing Co., 1958. A careful and perceptive guide to recent papal teaching to which the above paper is much indebted.
3.
Leemino, Bernard, The Churrhes and the Church. London: Darton, Longman and Todd, 1960. The section on "Catholic Principles Relative to Ecumenism" has the great merit of keeping clearly in view throughout the concrete circumstances of the actual ecumenical situation, particularly in England and on the mission fields.
4.
Dumont, C.J., Approaches to Christian Unity. London: Darton, Longman and Todd, 1959. A collection of brief but stimulating and often original chapters on a wide variety of ecumenical questions.
5.
Bellini, Alberto, Il Movimento Ecumenico. Padua- Rome -Naples: Pesbyterium, 1960. A few chapters devoted to Catholic ecumenism provide a brief but very competent treatment of the theological principles.
6.
Sartory, Thomas, "Die Kirche und die Kirchen" in Feiner-Trütsch-Böckle, Fragen der Theologie Heute. Zürich- Cologne: Benziger, 1957. This article summarizes the conclusions of the author's important work (shortly to appear in English), Die Oekumenische Bewegung und die Einheit der Kirche (Meitingen bei Augsburg: Kyrios Verlag, 1955) and takes account of studies published in the meantime.
7.
Various articles in the ecumenical reviews Istina (Paris) and Irénikon (Chevetogne, Belgium).
