PlayStation 4 sales top 6M units in less than four months
Sony’s game console is a smashing success and is now on sale in 57 countries.
PlayStation 4 - Wikipedia
Playstation 4 sales surpass 6M in less than 4 months – GeekWire
Sony PlayStation 4 sales top 35 million after holiday boost
Sony Celebrates Sale of 86 Million PS4 Units for 5th Anniversary
PlayStation has its second best year ever as PS4 sales surpass 110m
PS5 vs PS4 Sales Comparison - January 2023
The PlayStation 4 Is Still Outselling Every Other Console, Including Nintendo Switch
PlayStation 4 lifetime unit sales worldwide 2023
PS5 vs PS4 Sales Comparison in the US - September 2023