There are a number of writers against the Sabellians, and against Marcellum of Ancyra. So far I see Tertullian, Hippolytus, Cyprian, Dionysius of Rome, Eusebius, Basil and Epiphanius, who represent a wide variety of Christological viewpoints.
One of the more interesting is Dionysius of Rome:
Dionysius of Rome Against The Sabellians - Greek Text with English translation
https://earlychurchtexts.com/public/...sabellians.htm
His denunciation of Sabellius sounds like it comes from a position of affirming the Divine Monarchy, and sounds to me as almost a 'oneness' position.
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Wiki gives a reference that Sabellius uses the shorter baptism forum, that would be good to track down.
J.H. Blunt, p.332, Heik, p 150, Kelsey, pp. 40,41
John Henry Blunt - Dictionary of sects, heresies, ecclesiastical parties, and schools of religious thought (1874)
https://books.google.com/books?id=z-gCAAAAQAAJ&pg=PA332
https://catalog.hathitrust.org/Record/011983628
p. 330-332 on the Monarchians does not mention baptism, it is generally a fair and solid article, and on p. 331 is the reference to the quirky Dionysius of Rome piece.
The reference looks to be to p. 340.
https://books.google.com/books?id=z-gCAAAAQAAJ&pg=PA340
Quote:
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The second stage of Montanism is clearly marked by an alteration in the formula of Baptism. Montanus himself had retained the Catholic form. For this we have the evidence of Athanasius, who writes:...
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(A rather incredible section, note that it does not have the Rebaptism treatise.)
Otto W. Heik - History of Christian Thought,
Morton T. Kelsey - (various books on tongues and more)
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