File:Play and play materials for the pre-school child (1900) (14580395868).jpg - Wikimedia Commons
Montessori vs. traditional preschool: How to choose - Today's Parent
Play and Play Materials for the Pre-School Child / Mitchell, Harriet (1900) (1900) [Leather Bound]
Learn the History of Playgrounds and Playground Equipment from AAA State of Play
Developmental Stages of Play - Piaget — My Teaching Cupboard
The influence of neighbourhoods on early childhood development
What Kinds of Toys did Children Play With in the Past? - Wooden Earth
Vintage: Early 20th Century Kids Playgrounds MONOVISIONS - Black & White Photography Magazine
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Early 1900s children playing hi-res stock photography and images - Alamy
Stages and Types of Play for Babies and Toddlers
UK children not allowed to play outside until two years older than parents' generation, Children
