To the Basic Latin resources quoted on pg. 15 fn. 34 add Liesner, Malte. 2012. Arbeitsbuch zur lateinischen historischen Phonologie. Wiesbaden: Reichert. This book will be a great complement to my book if you are teaching a class in the historical grammar of Latin and your students know German. It's got great problem sets and exercises and I'm sure that anybody who worked her/his way through this book would have a very solid knowledge of Latin phonology. Since U.S. students almost never know German, you might find it useful to translate some of the exercises for them.