Gregory's Rule

[Steven Avery]

Avrin Leila., 1991, Scribes, script, and books: the book arts from antiquity to the Renaissance, Chicago, London.
https://books.google.com/books?id=4q1MHDoFVwkC&pg=PA213

reference was found here
https://pdfs.semanticscholar.org/728c/d1537b7ad2cb6adadd019a18d7465f31cfdf.pdf

 

[Steven Avery]

It is generally accepted that the quires of Late Antique codices are made up of four bifolios, starting with the flesh side of the parchment outermost and following Gregory’s rule through the whole quire.
https://www.google.com/url?sa=t&rct..._content.pdf&usg=AOvVaw3cxHWQncrmvupatNVIJhra

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