5 Creative Ways You Can Enjoy Urban Sketching in Winter - Toby Urbansketch
Urban Sketching: The Beginner's Guide - Blog
Learn all about urban sketching with this bundle
The Beginner's Guide To Urban Sketching - By Taria Dawson (paperback) : Target
The Urban Sketcher: Techniques for Seeing and Drawing on Location - Kindle edition by Holmes, Marc Taro. Arts & Photography Kindle eBooks @ Amazon.com.