Warf, Barney:
Reach Out and Touch Someone: AT&T's Global Operations in the 1990s. 1998. — 255-267.

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https://katalog.bibliothek.tu-chemnitz.de/Record/ai-49-aHR0cDovL2R4LmRvaS5vcmcvMTAuMTExMS8wMDMzLTAxMjQuMDAxMTk
(Datum: 17.11.2019)