King, K., & Ball, D. (1989). A holistic approach to accident and injury prevention in children's playgrounds. LSS.
Chicago-viite (17. p.)King, Karen, ja David Ball. A Holistic Approach to Accident and Injury Prevention in Children's Playgrounds. London: LSS, 1989.
MLA-viite (8. p.)King, Karen, ja David Ball. A Holistic Approach to Accident and Injury Prevention in Children's Playgrounds. LSS, 1989.
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