Sony retires the Walkman cassette player after 30 years - Play

Rewinding to the age of the Sony Walkman, Caroline Sullivan

Walkman - Wikipedia

Sony retires the Walkman

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A Man Discovers a Sony Walkman from 1979 in a Forgotten Cardboard Box, and He Ends Up Selling it for $1,200, William Tracy

Sony is still manufacturing radios with cassette players. : r/mildlyinteresting

Portable Audio in the 21st Century, by Gary Bunker

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Why did Sony stop making walkmans/cassette players? - Quora