1) Gopnik, Adam. “Shootings.” The New Yorker. 30 April 2007.
<www.newyorker.com/talk/comment/2007/04/30/070430taco_talk_gopnik>
(ignore the cartoon)

2) Lewis, C. S. “Sexual Morality.” Mere Christianity.
<www.philosophyforlife.com/mc15.htm>

3) Gore, Al. “Nobel Lecture.” 10 December 2007.
<nobelprize.org/nobel_prizes/peace/laureates/2007/gore-lecture_en.html>