Commodore Plus/4 PSU OLED Digital Gray UK - Replacement Commodore Plus/4 Power Supply, UK Plug
Tynemouth Software: Commodore plus/4 7 pin power conversion
Universal power supply C64, VIC-20, Plus/4 and C128 – Vintage is The New Old
ftp.funet.fi:/pub/cbm/schematics/computers/plus4/
COMMODORE PLUS/4 COMPUTER With Original Box & Manuals No Power Supply £94.32 - PicClick UK
COMMODORE PLUS 4 Power Supply / Transformer AND Joystick £25.00 - PicClick UK
RetroPower PSU - C64 Power Supply, C128 Power Supply, Commodore Plus/4 Power Supply, Amiga Power Supply, ZX Spectrum Power Supply, Atari Power Supply, Sinclair QL Power Supply, TI-99/4A Power Supply, ColecoVision Power
Amiga DUO+ PSU Smart power supply for dual Commodore Amiga systems.
Gravis Ultrasad – Building a C64 power supply
C64 Power Supplies – breadbox64.com
Commodore Plus/4 - Wikipedia
Commodore Service and Restorer - first steps for Commodore 64, 16, 116, Plus 4, 128