Zoe Kleinman (3. aprill 2023). "Mobile phone inventor made first call 50 years ago" [Mobiiltelefoni leiutaja tegi esimese kõne 50 aastat tagasi]. bbc.com (inglise). BBC News. Vaadatud 3. aprillil 2023. On 3 April 1973, Marty Cooper stood on a corner of Sixth Avenue in New York and took a phone book from his pocket.
