Julia and Jacques Cooking at Home: A Cookbook. https://www.amazon.com/dp/0375404317/ref=cm_sw_r_apan_glt_fabc_5NXK3RM1SQKDCJE867SB
Couldn't recommend this more.
They were very good friends and cooked often. They actually made a whole series Jacques and Julia Cook at Home. Some eps are on Youtube and if you have Amazon Prime all of the episodes are available.
The recipes from the book are on Amazon although I don't really recommend it. According to Jacques (from some interviews) they really didn't plan the episodes - they just started cooking some there's not really anything new or interesting in terms of recipes.
2 books. Just bcz its very rare for two chef megastars to be in one kitchen, abeit, coorperate and have their own series, Julia Child & Jacques Pepin: http://www.amazon.com/Julia-Jacques-Cooking-at-Home/dp/0375404317
For anyone whom still can access the PBS series, their interaction is epic. I believe its the last cooking show that Childs actually did hands on cooking. Her later years of shows inviting guests was good too but not the same.
Classic and practical techiques and dishes.
2nd book.
http://www.amazon.com/Baking-Bible-Rose-Levy-Beranbaum/dp/1118338618
Techniques and very good advice from many years of experience but steps are pretty complex if you dont have the time nor want to invest in the effort.