The New Drawing on the Right Side of the Brain An excellent book for a starter or improver
Everyday Matters Inspirational - the one that got me sketching
Keys to Drawing Sensible and practical, an invaluable guide
Andrew Wyeth: The Helga Pictures A eulogy to one artist's genius - powerful
The Urban Sketching Handbook: Architecture and Cityscapes: Tips and Techniques for Drawing on Location (Urban Sketching Handbooks, 1) Many useful tips to be found in this handy little book
Urban Watercolor Sketching: A Guide to Drawing, Painting, and Storytelling in Color Made me see colour with new eyes & improved my work greatly
The Urban Sketcher: Techniques for Seeing and Drawing on Location Full to the brim of excellent tips and practical advice by a great artist