Most books and articles are mentioned here:
https://www.uni-due.de/DI/DI_Bibliography.htm#dialectsAlso:
about Corca Dhuibhne there are 2 books in French
https://en.wikipedia.org/wiki/Marie-Louise_Sjoestedt(one of her books is on wikisource).
There are 2 books on Gaoth Dobhair that aren't mentioned on the page:
Comhréir Ghaeilge Ghaoth Dobhair, by D. Ó Muirí.
and a dissertation about Gaoth Dobhair Irish (mainly morphology) : Deilbhíocht Ghaeilge Ghaoth Dobhair, also by D. Ó Muirí. It exists as a PDF (I asked the university to scan it), I can send it to you if you like.
I guess you already know Ó Siadhail's 'Modern Irish. Grammatical structure and dialectal variation', Cambridge: University Press.
And Wagner's linguistic atlas, in 4 volumes...