Because of inconsistent treatment of "ecumenical" resources one gets a very slanted/erroneous view of the Angelican/Catholic/Lutheran/Orthodox traditions.
Under Anglican although pertaining to Ecumenical I find
- Swete, Henry Barclay. The Apostles’ Creed: Its Relation to Primitive Christianity. 3d ed. Cambridge: University Press, 1894.
- Kelly, J. N. D. Early Christian Creeds. Third Edition. London; New York: Continuum, 2006.
- Pullan, Leighton. Early Christian Doctrine. Third Edition. Oxford Church Text Books. New York: Edwin S. Gorham, 1905. (although it is questionable that this is a Confessional Document)
- Bethune-Baker, J. F. The Meaning of Homoousios in the “Constantinopolitan” Creed. Edited by J. Armitage Robinson. No. 1. Vol. 7. Texts and Studies: Contributions to Biblical and Patristic Literature. Cambridge: Cambridge University Press, 1901. (although it is questionable that this is a Confessional Document)
- Kelly, J. N. D. Early Christian Doctrines. Fifth, Revised. London; New Delhi; New York; Sydney: Bloomsbury, 1977. (although it is questionable that this is a Confessional Document)
- McGrath, Alister. Faith and the Creeds. Vol. 1. Christian Belief for Everyone. London: SPCK, 2013.
Questionable resources under Lutheran include:
- Von Harnack, Adolf. The Apostles’ Creed. Edited by Thomas Bailey Saunders. Translated by Stewart Means. London: A & C Black, 1901.
Questionable resources under Catholic include:
- Hefele, Charles Joseph. A History of the Councils of the Church. Translated by William R. Clark. Vol. 1. Edinburgh: T&T Clark, 1871.
- Hefele, Charles Joseph. A History of the Councils of the Church. Translated by Henry Nutcombe Oxenham. Vol. 2. Edinburgh: T&T Clark, 1876.
- Hefele, Charles Joseph. A History of the Councils of the Church. Translated by Edward Hayes Plumptre. Vol. 3. Edinburgh: T&T Clark, 1883.
- Hefele, Charles Joseph. A History of the Councils of the Church. Translated by William R. Clark. Vol. 4. Edinburgh: T&T Clark, 1895.
- Hefele, Charles Joseph. A History of the Councils of the Church. Translated by William R. Clark. Vol. 5. Edinburgh: T&T Clark, 1896.
Either all resources applicable to a tradition should be attached to it - without reference to "modern" or "ecumenical" OR all resources applicable to the "ecumenical" should be there and only there. What we have at the moment is random classification so one has to look everywhere especially as the creeds have broader applicability than the councils.
The other aspect that is "confusing" is that the category appears not to be "confessional documents" but "confessional documents and related commentaries and studies". This is not a problem as long as the documentation makes it very clear what is the intended coverage.
