El Ejercito de Carlos V: Los Tercios Espanoles/Carlos Montuenga, Delfin Salas. Ediciones Barreira. Softcover. First edition 1984. Out of print. Condition: Very good. ISBN 8486071054
Produced in Spanish with an English summary and illustrated throughout by photographs, drawings and excellent colour plates, this book examines the developments that took place in the weapons, armour, uniforms and infrastructure of the Spanish infantry during the 16th century, when they were organized into Tercios by Charles V, each of which consisted of twelve companies of 250 men, representing the first large permanent infantry units in Europe.