1.Written by Barton D. Schmitt, MD.Sex Education for Young Children.https://www.summitmedicalgroup.com/library/pediatric_health/hhg_sex_ed_for_preschoolers/.2017
2.David Coleman .Dear David Coleman: 'My four-year-old son still touches my breasts'.https://www.independent.ie/life/family/parenting/dear-david-coleman-my-fouryearold-son-still-touches-my-breasts-35642430.html.2017/04/25.