Book Recommendations

General Urban Sketching

The Urban Sketching Handbook: 101 Sketching Tips: Tricks, Techniques, and Handy Hacks for Sketching on the Go (Urban Sketching Handbooks) by Stephanie Bower 

The Art of Urban Sketching by Gabriel Campanario

The Urban Sketching Handbook: Architecture and Cityscapes: Tips and Techniques for Drawing on Location (Urban Sketching Handbooks) by Gabriel Campanario

How to Draw What you See by Rudy De Reyna

5-Minute Sketching -- Landscapes: Super-quick Techniques for Amazing Drawings by Virginia Hein 

The Sierra Club Guide to Sketching in Nature by Cathy Johnson

Urban Sketching Step by Step: Techniques for creating quick & lively urban scenes by Klaus Meier-Pauken

The Urban Sketching Handbook: Techniques for Beginners: How to Build a Practice for Sketching on Location by Suhita Shirodkar

5-Minute Sketching -- Architecture: Super-quick Techniques for Amazing Drawings by Liz Steel 

The Urban Sketcher: Techniques for Seeing and Drawing on Location by Marc Taro Holmes 

5-Minute Sketching -- Architecture: Super-quick Techniques for Amazing Drawings by Liz Steel

Urban Sketching: The Complete Guide to Techniques by Thomas Thorspecken

The Complete Urban Sketching Companion: Essential Concepts and Techniques from The Urban Sketching Handbooks--Architecture and Cityscapes, ... People and Motion, Working with Color by Shari Blaukopf, Stephanie Bower, & Gabriel Campanario

Urban Sketching and Painting (Pocket Art Guides)  by Parramón Editorial Team

Perspective

The Urban Sketching Handbook: Understanding Perspective: Easy Techniques for Mastering Perspective Drawing on Location (Urban Sketching Handbooks) by Stephanie Bower 

Perspective Made Easy by Ernest R. Norling 

Pen and Ink

Pen and Ink: A Simple Guide by Alphonso Dunn

Drawing in Pen & Ink (First Steps) by Claudia Nice

Painting with Watercolor, Pen & Ink by Claudia Nice 

Painting Weathered Buildings in Pen, Ink & Watercolor by Claudia Nice

Creating Textures in Pen & Ink With Watercolor by Claudia Nice 

Painting Nature in Pen & Ink with Watercolor by Claudia Nice 

Digital Sketching - Drawing with a Tablet

The Urban Sketching Handbook: Drawing with a Tablet: Easy Techniques for Mastering Digital Drawing on Location (Urban Sketching Handbooks) by Uma Kelkar 

Drawing People

The Urban Sketching Handbook: People and Motion: Tips and Techniques for Drawing on Location (Urban Sketching Handbooks) Urban Sketching Handbooks by Gabriel Campanario

Sketching People: An Urban Sketcher's Manual to Drawing Figures and Faces by Lynne Chapman

The Urban Sketching Handbook: Drawing Expressive People: Essential Tips & Techniques for Capturing People on Location (Urban Sketching Handbooks) by Róisín Curé

Drawing the Head and Hands by Andrew Loomis

5-Minute Sketching -- People: Super-quick Techniques for Amazing Drawings by Pete Scully

Drawing Animals

5-Minute Sketching -- Animals and Pets: Super-quick Techniques for Amazing Drawings by Gary Geraths

Watercolor

Creating Textures in Watercolor: A Guide to Painting 83 Textures from Grass to Glass to Tree Bark to Fur by Cathy Johnson 

The Urban Sketching Handbook: Working with Color: Techniques for Using Watercolor and Color Media on the Go (Urban Sketching Handbooks) by Shari Blaukopf

Urban Watercolor Sketching: A Guide to Drawing, Painting, and Storytelling in Color by Felix Scheinberger

Developing a Sketchbook Habit

Everyday Sketching and Drawing: Five Steps to a Unique and Personal Sketchbook Habit by Steven B. Reddy, Stephanie Bower, et al.

Artist's Sketchbook: Exercises and Techniques for Sketching on the Spot by Cathy Johnson 

Artist's Journal Workshop: Creating Your Life in Words and Pictures by Cathy Johnson