http://www.thegeniusofplay.org/
https://www.naeyc.org/resources/topics/play
http://www.pbs.org/parents/education/going-to-school/choosing/comparing-preschool-philosophies/
http://www.earlychildhoodnews.com/earlychildhood/article_view.aspx?ArticleID=453
https://www.theatlantic.com/education/archive/2016/05/why-young-kids-learn-through-movement/483408/
https://www.theguardian.com/education/2016/sep/20/grammar-schools-play-europe-top-education-system-finland-daycare
https://www.nytimes.com/2018/01/29/well/family/taking-playtime-seriously.html
https://www.scientificamerican.com/article/the-serious-need-for-play/
https://www.naeyc.org/our-work/families/10-things-every-parent-play
https://www.babble.com/parenting/the-case-for-old-school-kindergarten-why-we-need-to-let-our-kids-play/
https://www.weforum.org/agenda/2016/10/forget-flashcards-play-with-sticks-an-expert-explains-how-children-learn/