*"Drinking Age ProCon.org." ProConorg Headlines. ProCon.org, 2 Apr. 2015. Web. 28 May 2015. <http://drinkingage.procon.org/>.
Griggs, Brandon. "Should the U.S. Lower Its Drinking Age? - CNN.com." CNN. Cable News Network, 4 Jan. 2015. Web. 31 May 2015. <http://edition.cnn.com/2014/07/16/us/legal-drinking-age/>.
Houghton Mifflin Harcourt Collections Grade 8. N.p.: Holt McDougal, 2014. Print.
Griggs, Brandon. "Should the U.S. Lower Its Drinking Age? - CNN.com." CNN. Cable News Network, 4 Jan. 2015. Web. 31 May 2015. <http://edition.cnn.com/2014/07/16/us/legal-drinking-age/>.
Houghton Mifflin Harcourt Collections Grade 8. N.p.: Holt McDougal, 2014. Print.