1985: Thomann, Günther, Christoph Matthäus Pfaff (1686–1760) und die Anfänge der dogmengeschichtlichen Disziplin, Blätter für württembergische Kirchengeschichte, 85, 1985, 83–133
1992: Thomann, Günther, "John Ernest Grabe (1660–1711): Lutheran Syncretist and Patristic Scholar". Journal of Ecclesiastical History; 43, pp. 414–27, July 1992.
1993: Thomann, Günther, Studies in English Church History: Essays in English Liturgy and Piety from the Celtic Church to the Nonjurors, 9 November 2012.
1994: Thomann, Günther, The Epiclesis in the Gregorian Canon, Together with a Few Remarks on the Epiclesis in the Book of Common Prayer, Anglican Catholic Church.
1994: Thomann, Günther, Uniate Movements With Eastern Orthodoxy and Their Failure. Stoke-on-Trent: [no publ.]
1995: Thomann, Günther, The Western Rite in Orthodoxy: Union and Reunion Schemes of Western and Eastern Churches with Eastern Orthodoxy – a brief historical outline, 3rd ed., Nürnberg, private publication, pp. 51–74.
1995: --do.-- --do.-- d, 106 pp. Claremont, CA: Anglican Theological Seminary in California
1997: Thomann, Günther, The Anglican Crisis: A Brief Survey of the Origin and Development of Independent Anglican Churches.
1998: Thomann, Günther, The Revival of Hellenist Religion: Agrippa of Nettesheim, the Hermetic Order of the Golden Dawn and the Neo-pagan Movement.
2001: Thomann, Günther, A Short Biography of the Reverend Richard Williams Morgan (c:1815–1889), the Welsh poet and re-founder of the ancient British Church. An enquiry into the origins of neo-Celtic Christianity, together with a reprint of several works by Richard Williams Morgan and Jules Ferrette, etc. Pp. iii+133. Solna, Sweden: St Ephrem's Institute.
2013: Thomann, Günther, and Giewald, Arne: The Lutheran High Church Movement in Germany and Its Liturgical Work: An Introduction, no place of publication.
A number of articles has been published in The Oxford Dictionary of National Biography, Biographisch-Bibliographisches Kirchenlexikon, and Anglo-Orthodoxy and Church and King.