Nelson H. F. Beebe at the University of Utah has used tools to search the collected bibliographies of over 784,000 publications to create a bibliography of publications on the Ada Programming Language, Charles Babbage, and Ada Lovelace. This bibliography is updated frequently, and contains (as of this writing) over 1500 entries. Additional versions and more information can be found at
http://www.math.utah.edu/pub/tex/bib/index-table-a.html#adabooks; the tools used can be found at
http://www.math.utah.edu/pub/bibtools.html.
The bibliography doesn’t include articles in the Ada User Journal or SIGAda’s Ada Letters, these have their own bibliographies,
http://ftp.math.utah.edu/pub//tex/bib/adauserj.pdf and
http://ftp.math.utah.edu/pub//tex/bib/sigada.pdf, respectively.