PCB Engineering Ruler, Scratch Free Accurate Spacing Clear Metric PCB Scale Ruler 3 Sizes for Electronic Engineers - - Amazon.com
PCB Design for Real-World EMI Control (The Springer International Series in Engineering and Computer Science, 696): Archambeault, Bruce R., Drewniak, James: 9781402071300: Amazon.com: Books
The Hitchhiker's Guide to PCB Design: Things You Wish You Knew Yesrerday and Will Need to Know Tomorrow: Automation, EMA Design: 9780368246968: Amazon.com: Books