How to press L3 and R3. (On PS3 and on PS4) - YouTube
How do you fix the L3 from doing this? : r/PS3
Ken Umemoto's vReality: PlayStation Dualshock 3 L3 Button Fix
How to fix a broken PS3 Controller - YouTube
L3 R3 Back Touchpad Button Module For Ps Vita Psv1000 2000 Sync Game For Ps3 Ps4 Gamepad Controller Parts Gaming Accessories - Accessories - AliExpress
What is L3 on a PlayStation controller? - Quora
JoyToKey PS3 Controller Layout by PaperDerp on DeviantArt