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Report: PlayStation Brand 'In Decisive Decline in Japan,' Research Firm 'Deeply Concerned'
Gamasutra - NPD: Behind the Numbers, February 2010
It's all about Nintendo as Wii, DS dominate November sales | Ars Technica
List of best-selling game consoles - Wikipedia
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By the numbers: in portable gaming, Nintendo's loss is Apple's gain - The Verge
Nintendo Switch OLED's lack of ambition has opened the door for a Sony PSP 5G | T3
PSP & PSV unit sales U.S. 2005-2019 | Statista
Most sold video game consoles worldwide | Statista
A Visual Look at PlayStation Sales Numbers
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PSP Sales Are Up Year After Year | by Sohrab Osati | Sony Reconsidered
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NPD 2009 sales figures | Video Game Sales Wiki | Fandom
3DS vs PSP – VGChartz Gap Charts – October 2018 Update
NPD 2008 sales figures | Video Game Sales Wiki | Fandom
PSP & PSV unit sales worldwide 2004-2022 | Statista
Japan's October Hardware Sales | TheSixthAxis
Worldwide Hardware Sales 2010 | TheSixthAxis
Worldwide Hardware Sales 2010 | TheSixthAxis
Exclusive: Sony PSP Versus Nintendo DS - The Sales Showdown
