I recently bought The Art of Bowing Practice from Amazon and borrowed the Art of Practising the Violin from the Library, both by Robert Gerle. I have already found them really useful.
There is a lot of technique in them both, useful ways to think about things like positions, finger patterns and bow holds. There are interesting sections on memorizing material and practising for performance. He also gives tips for good intonation. He introduces this subject by saying
"The elusive goal of perfect intonation is almost impossible to achieve on a stringed instrument. It is like trying to hit the bullseye of a small, moving target with a bow and arrow from a bicycle on a tightrope"
So true. But he also gives a number of useful exercises to help.
Both of these books are great for violinists.