Here is Thomas Aquinas stating that scripture alone is the rule of faith in the church while commenting on John 24:21 and in passing on Galatians 1:9:
Let us note that although many might write concerning catholic truth, there is this difference among them: those who wrote the canonical Scriptures, the Evangelists and Apostles, and others of this kind, so constantly assert it that they leave no room for doubt. That is his meaning when he says 'we know his testimony is true.' Galatians 1:9, "If anyone preach to you a gospel other than that which you have received, let him be anathema!" The reason is that only canonical Scripture is a rule of faith. Others, however, so wrote of the truth that they should not be believed save insofar as they say true things."
From Thomas's commentary on John's Gospel, Super Evangelium S. Ioannis Lectura, ed. P. Raphaelis Cai, O.P., Editio V revisa (Romae: Marietti Editori Ltd., 1952), p.488.
(Latin Text: Notandum autem, quod cum multi scriberent de catholica veritate, haec est differentia, quia illi, qui scripserunt canonicam Scripturam, sicut Evangelistic et Apostoli, et alii huiusmodi, ita constanter eam asserunt quod nihil dubitandum relinquunt. Et ideo dicit Et scimus quia verum est testimonium eius; Gal. I, 9: Si quis vobis evangelizaverit praeter id quod accepistis, anathema sit. Cuius ratio est, quia sola canonica scriptura est regula fidei. Alii autem sic edisserunt de veritate, quod nolunt sibi credi nisi in his quae ver dicunt.)
This is an interesting comment from the 'angelic doctor'. It seems that the standard Roman rebuttal of the argument that Thomas is advocating sola scriptura here is that the comment only refers to canonical scripture in contrast to non-canonical scripture. That would seem to me to be a fairly weak argument, as mutatis mutandis, the rule would surely apply to all non-canonical writings and not just apocrypha. Support for this view can certainly be garnered from earlier Fathers of whom Thomas would have been aware, remembering that Thomas was a synthesiser of the tradition. When I last read Thomas on the role of scripture in the church he indeed advocated that scripture provided the only source from which church teaching could be derived. I will have to revisit that, but for now the post stands.