RetroArch 1.7.6 released: PlayStation 2 port released with 4 cores, significant progress made on PlayStation 4/Xbox One ports, Ozone menu driver (Switch-esque) added and more! - Wololo.net
Native Retroarch emulator has been ported to the PS4 - Hackinformer
PS4 - (Updated) RetroArch (unofficial PS4- R2) Now includes 37 libretro cores (Yabause / Mupen64 addded) | PSX-Place
Retro Gaming on PS4 6.72 By RetroArch Emulator : r/ps4homebrew
RetroArch
RetroArch mGBA Gameboy / Gameboy Color PS2 on PS4 Emulator Port | PSXHAX - PSXHACKS
RetroArch (PS2) for PS4 Released : r/ps4homebrew
News: RetroArch FINALLY gets released on PlayStation 4 with 25 cores including PS1, MAME and experimental Nintendo 64 emulators & VitaGrafix 5.0.0 released for the PSVita with re-written parser and more - Wololo.net
How to play PS2 games on your jailbroken PS4 9.00 and lower - PC Guide
EP 7) How to Setup RetroArch Emulator on PS4 (9.00 or Lower) - YouTube
RetroArch PS4 Official Version Soon, FCEUmm NES Emulator Progress Updates | PSXHAX - PSXHACKS
PS2 - (Progress Update) RetroArch PS2 - New port now In development for PlayStation 2 | PSX-Place
SNESticle SNES Emulator for PS2 Converted to PS4 PKG on 9.00 | Page 2 | PSXHAX - PSXHACKS
PlayStation4 – Libretro
HOW TO MAP PS4 & PS3 & PS2 CONTROLLER / CONTROLLER MAPPING on RetroArch - YouTube
Emulation: PS4 officially added to supported platforms in Retroarch - Wololo.net
PlayStation 2 (PS2) Emulator on RetroArch: PCSX2 Core (Install guide: setup / config / tutorial) - YouTube