Two good instructional art books by Juliette Aristides that are a pleasure to read:
Classical Drawing Atelier: A Contemporary Guide to Traditional Studio Practice by Juliette Aristides
Classical Painting Atelier: A Contemporary Guide to Traditional Studio Practice by Juliette Aristides (cover pictured above)
These instructional books which emphasize classical techniques using examples from the old masters and contemporary realists, are quite well written. I would recommend them to anyone who is a student of drawing or painting. I bought the painting one a few months back, and just checked the drawing one out from the library. In my opinion, the painting one (which is Aristide's most recent) is superior, but both are excellent. She reminds us that the history of art is always today's artists' greatest resource.