This book speaks directly to the thousands of IBM i programmers who develop in RPG, COBOL, CL, and DDS every day.
Written by Susan Gantner
Whether you're an RSE neophyte, an experienced RSE user, or still a dyed-in-the-wool SEU user wondering if there's a better way, you should read this book. It does an excellent job of covering the basics while still offering many tips and details beyond the basics that even I didn't know--despite having used RSE for years.
The authors--Don Yantzi and Nazmin Haji--are both part of the IBM development team that produces RSE, so it's hard to find anyone who knows the toolset better.