Dr. Monk's DIY Electronics Blog: On Switch for Raspberry Pi
Raspberry Pi 2 is camera shy: flash causes mini-computer to switch off | Raspberry Pi | The Guardian
A Power Button For Raspberry Pi, Courtesy Of Device Tree Overlays | Hackaday
5V 3A Micro USB Power Supply Charger Adapter On/off Switch for Raspberry Pi 3 | eBay
Raspberry Pi Accessory Starter Pack for Raspberry Pi 3 B and B Plus – Vilros.com
Getting started with electronics: LEDs and switches using Raspberry Pi — The MagPi magazine
Amazon.com: [5V 3A 15W] Raspberry Pi 3 Case, iUniker Pi 3 b+ Case, Raspberry Pi 3 Power Supply with Switch Raspberry Pi Power Supply (UL Listed) : Electronics
Adding a Switch » Raspberry Pi Geek
For Raspberry Pi 4B/3B+/3B, X735 V3.0 DC 6V-30V Safe Shutdown Power Ma – Geekworm