This book:
Guitarmaking: Tradition and Technology (Guitar Reference) https://www.amazon.com/dp/0811806405/ref=cm_sw_r_cp_apa_i_CkL7Db2YMXE78
Definitive book on technique. Covers both nylon and steel spring outlining both traditional hand tools and power tools. Only one style of bracing for each but there's plenty here to get you started.
This one (along with the expensive simogi books- 'the responsive guitar') is more about theory and bracing styles:
The Luthier's Handbook: A Guide to Building Great Tone in Acoustic Stringed Instruments https://www.amazon.com/dp/0634014684/ref=cm_sw_r_cp_apa_i_UnL7DbFD2VDNK