Why Sony Has Never Pursued Another Handheld Console Like the PSP or PS Vita

Sony penetrated the portable gaming scene with the PlayStation Portable and PS Vita, but it failed to topple Nintendo

Sony Rumored to Be Working on New Handheld Gaming Device - CNET

Not the PS Vita 2 — Why I'm nervous about the new leaked PlayStation Portable (report), playstation portable

Random: Fan-Made 'Next-Gen PlayStation Portable' Concept Imagines A World Where Sony Takes On Nintendo (Again)

Sony Discontinues the PlayStation Vita, Its Least Successful Console

How Sony tried (and failed) to beat Nintendo at handheld gaming

Life in 16-bit: PSP retrospective

Here's What A Modern PlayStation Portable Could Look Like, playstation portable

Is Sony thinking of bringing back the PSP or PS Vita?

PlayStation Vita Review: Finally, Console-Level Gaming in a Handheld Device, psp vita

Report: Sony May Be Working On A New PlayStation Handheld After All

Is Sony Likely to Release a New Handheld Console Soon?

9 Reasons Why the PS Vita Failed