1. Global Knowledge Transfer and Telecommunications: The Bell System in Japan, 1945-1952;Adams;Enterprise Soc. 2008,2007
2. Back, G.I. (1950a). Letter to Homer Sarasohn. http://honoringhomer.net/letters/george_back.pdf
3. Back, G.I. (1950b). Letter to Charles Protzman. http://www.puritangift.com/pdf/letter_back.pdf