(en) Brian Stelter, « AT&T to spin off and combine WarnerMedia with Discovery in deal that would create streaming giant », CNN Business, (lire en ligne, consulté le )
(en) Kleinfield, Sonny, The biggest company on earth : a profile of AT&T, New York, Holt, Rinehart, and Winston, , 1re éd. (ISBN978-0-03-045326-7, LCCN80013095)