Lou Ottens, Inventor of the Audio Cassette Tape, Dead at 94
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Blank Cassettes: Audio - Philips - No Sort - C - 60 - Netherlands (1966)
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Cassette tape - Wikipedia
Inventor of Compact Cassettes, which spawned countless mixtapes, dies at 94 - WTOP News
The Man Who Invented The Cassette Tape Has Died; Lou Ottens Was 94 : NPR
Cassette tape - Wikipedia
Cassette | Audio Recording, Magnetic Tape, Music | Britannica
The Story of Sound part 4: Wire, War-time secrets, and Walkman's | Norfolk Record Office
Forgotten audio formats: Digital compact cassette | Ars Technica
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A Brief Audio History of The Compact Cassette - YouTube
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Such a fun way to consume music': why sales of the 'obsolete' cassette are soaring | Cassette tape | The Guardian
Grundig C 100 and the early history of the Compact Cassette
