Looking for book recommendations on the history of engravings, especially on engravings made for books (e.g. frontispieces or book illustrations).

by vertexoflife
enormousloser

A good general introduction is Antony Griffiths, Prints and Printmaking: An Introduction to the History and Techniques (Berkeley and Los Angeles: University of California Press , 1996).

The International Fine Print Dealers Association has a good bibliography to get you started.

For book illustration you will most likely have to look for specialized scholarship on prints for books in a specific time period/culture; there isn't much in the way of good overviews. Can you give more specific information on your subject?