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Aristides, Juliette. Classical Painting Atelier. New York: Watson-Guptill Publications, 2008.

Brown, Jonathan; Garrison, Carmen. Velazquez – The Technique of Genius. Yale University Press, 2003.

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Carlson, John F. Carlson's Guide to Landscape Painting. Dover Publications, 1972.
ISBN-10: 0486229270
ISBN-13: 978-0486229270
Link to book on Amazon
Thanks to D. Melvin!

da Vinci, Leonardo. The Notebooks of Leonardo Da Vinci - Compiled and Edited from the Original Manuscripts by Jean Paul Richter. New York: Dover Publications, Inc., 1970.

De Boisbaudran, Lecoq. The Training Of The Memory In Art, And The Education Of The Artist (1914). Kessinger Publishing, LLC, August 10, 2009.

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Farington, Joseph. The Memoirs of Sir Joshua Reynolds. Pallas Athene, 2005.
Link to Book on Amazon

Schütze, Prof. Dr. Sebastian. Caravaggio. The Complete Works. ISBN: 978-3-8365-0183-5

Speed, Harold. The Science and Practice of Drawing. Dover Publications, 1972.

Velázquez's Fables, catalog: ISBN Museo del Prado: 978-84-8480-131-3