Recently, SBL Press clarified its guidance about citing J.-P. Migne’s Patrologia Latina based on the discovery that various year’s printings of certain volumes within Patrologia Latina have differences. Among these differences are variations in the column arrangements for the texts contained in Patrologia Latina. The Press’s initial recommendation was that
authors always check a PL volume title page to ensure that the printing is dated 1865 or earlier. If the publication or printing date is 1868 or later, we encourage authors to find an earlier printing of PL to cite.
The Press has subsequently “discovered that there are also variations between Migne’s original editions and his own later reprintings prior to transferring the rights to Garnier.” Consequently, the Press’s new recommendation is that
authors always check a PL volume title page to ensure that the printing is dated 1855 or earlier. If the publication or printing date is 1857 or later, we encourage authors to find the original printing of PL to cite. (underlining added)
As a further curiosity in this complex discussion, I noticed earlier today that James Dunn’s Word Biblical Commentary volume on Romans refers to the same testimony by Ambrosiaster as I went in search of the week before last (xlviii). Elsewhere, Dunn’s introduction copiously indexes its discussion to relevant primary literature. But, on Ambrosiaster’s comment, one is simply told
(text in SH [Sanday and Headlam], xxv–xxvi, and Cranfield, 20)
Sanday and Headlam refer to Ballerini’s edition of Ambrosiaster rather than to Migne’s, as does Cranfield. But, one wonders if the indirect citation of Ambrosiaster through these other authors derives, at least in part, from dynamics like those here that make the references of previous scholars rather more obscure.
For further discussion of the Patrologia Latina question, please see the SBL Handbook of Style blog and the initial question and update posts here.