"Antonio de Torres: Guitar Maker - His Life and Work." by José L. Romanillos
This meticulously researched book is divided into two parts. The first relates the life of Torres (1817-92) in the towns of Almeria and Seville; the second one deals with the more technical aspects of his instruments: his method of guitar construction, the plantillas he used, types of wood, the inlays, and his use of the tornavoz. The text also includes a catalogue of all known existing Torres guitars.

"Master Guitars." by Roy Courtnall
An essential text for aspiring classical guitar makers. Part 1 consists of eight chapters: each one presenting a biography and an in-depth plan of an instrument by a master luthier. These include Torres, Hernández, Hauser, Hernández y Aguado, Fleta, Bouchet, Friederich and Romanillos. Parts 2 and 3 describe the tools, materials, and procedures of the Spanish school of guitar construction. 

"A Collection of Fine Spanish Guitars from Torres to the Present." by Sheldon Urlik 
This book presents one of the world's finest collections of modern and contemporary Spanish Guitars. Over 65 classical and flamenco guitars are presented with documentation, technical information and insights into their historical significance. Makers represented include among others: A. Torres, M. Ramirez, S. Hernandez, D. Esteso, M. Rodriguez, H. Hauser, J. Romanillos, G. Smallman, J. Gilbert, T. Humphrey, P. Bernabé.