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9 "Psychology: Understanding Psychology: Chapter Overview: Chapter 4." Glencoe/McGraw-Hill. Web. 03 Mar "Puberty -- Changes for Males." Puberty. Web. 03 Mar "A Brief Biographical Sketchof G. Stanley Hall." A Brief Biographical Sketchof G. Web. 03 Mar "Growth and Development, Ages 13 to 17—What You Need to Know." Growth and Development, Ages 13 to 17—What You Need to Know. Web. 03 Mar

Mohammed Khalid10 "Identity Crisis - Theory and Research." About.com Psychology. Web. 03 Mar "Challenges of Adolescence." SUNY Upstate Medical University. Web. 03 Mar "Child Trends." Child Trends. Web. 03 Mar "Adolescence." The 2006 World Book Year Book: The Annual Supplement to the World Book Encyclopedia : A Review of the Events of Chicago: World Book, Print.