A Girl’s Changing Body: What Happens in Puberty. http://www.teens.webmd.com/girls-puberty-10/puberty-changing-body Accessed February 26, 2017
Puberty – boy changes, girl changes. http://www.cyh.com/HealthTopics/HealthTopicDetailsKids.aspx?p=335&np=289&id=1774 Accessed February 26, 2017
Is That Normal? 9 Surprising Age-Related Changes. http://www.shape.com/lifestyle/mind-and-body/normal-9-surprising-age-related-changes Accessed February 26, 2017
Signs of Puberty: What Happens to Boys and Girls. http://www.nhs.uk/Livewell/puberty/Pages/puberty-signs.aspx Accessed February 26, 2017