Ow cell phones have caused social changes

My eassy is college level. I also want the references checked.

References:

a? Kendall. (2004). Sociology in our times: the essentials (4th edition)
a? Ling, R. (2000). The impact of the mobile telephone on four established social institutions. ISSEI200 conference
a? Crystal, D. (2008). Text messages: Texting. ELT journal, 62(1),77-83