References
http://www.webmd.com/depression/guide/major-depression
http://www.beyondblue.org.au/the-facts
http://www.blackdoginstitute.org.au/docs/Factsandfiguresaboutmentalhealthandmooddisorders.pdf
http://www.mayoclinic.org/diseases-conditions/depression/basics/symptoms/con-20032977
http://www.drugs.com/cg/major-depression-in-adolescents.html
http://www.beyondblue.org.au/the-facts
http://www.blackdoginstitute.org.au/docs/Factsandfiguresaboutmentalhealthandmooddisorders.pdf
http://www.mayoclinic.org/diseases-conditions/depression/basics/symptoms/con-20032977
http://www.drugs.com/cg/major-depression-in-adolescents.html