Food and Wine Gazette
This is your go to book for Spanish cuisine. It has been compared many times to the Silver Spoon (for Italian cuisine) and that comparison is justified. This book could be considered as the bible of traditional Spanish cooking. I has been published over 35 years ago but still remains an excellent reference book of Spanish cuisine.
Founder & Head Chef of School of Wok
This is one of the first cookbooks that inspired me to cook a cuisine out of my comfort zone. One of the first cookery books that I found myself wanting to cook more and more out of (Primarily the Spanish version, and then when the English version came out - even better!)
In fact any of the big Phaidon one country encyclopaedic books (I have Japan & Cuba too but there are more). Comprehensive & brilliant for research and ingredient experimentation.
The ultimate resource for every Spanish home cook.