Zigterman, B. (2013, Dec 13). How We Stopped Communicating Like Animals: 15 Ways Phones Have Evolved. Retrieved from www.bgr.com/2013/12/13/telephone-timeline-a-brief-history-of the-phone/
Ross, I. M. (2014). Telephone Timeline. Retrieved from www.greatachievements.org
Blue, J. (2012, July 17). Some Unique Real Telephones. Retrieved from http://fashionportalsaga.blogspot.com/2012/07/some-unique-real-telephones.html
Staff Writer. 1915: First Transcontinental Telephone Call. Retrieved from http://www.corp.att.com/attlabs/reputation/timeline/15tel.html
Unknown. Evolution of Cell Phones. Retrieved from www.galleryhip.com/evolution-of-cell-phones.html
Ross, I. M. (2014). Telephone Timeline. Retrieved from www.greatachievements.org
Blue, J. (2012, July 17). Some Unique Real Telephones. Retrieved from http://fashionportalsaga.blogspot.com/2012/07/some-unique-real-telephones.html
Staff Writer. 1915: First Transcontinental Telephone Call. Retrieved from http://www.corp.att.com/attlabs/reputation/timeline/15tel.html
Unknown. Evolution of Cell Phones. Retrieved from www.galleryhip.com/evolution-of-cell-phones.html