Birgitte Wistoft (2010). "A Devilish Device: Attitudes to Telephony 1876–1920". The International Journal for the History of Engineering & Technology. 80 (2): 217,223. doi:10.1179/175812110X12714133353795. S2CID111285194.
Stig Hjarvard (September 2004). "The Globalization of Language. How the Media Contribute to the Spread of English and the Emergence of Medialects". Nordicom Review. 25 (1–2): 87. CiteSeerX10.1.1.732.6541.
Birgitte Wistoft (2010). "A Devilish Device: Attitudes to Telephony 1876–1920". The International Journal for the History of Engineering & Technology. 80 (2): 217,223. doi:10.1179/175812110X12714133353795. S2CID111285194.