California Park and Recreation Society
 
National Recreation and Park Association
www.nrpa.org

NRPA Magazine
www.parksandrec-magazine.org

The Eco Gateway Link Center for Urban Parks, Trails, and Paths
http://www.ecoiq.com/onlineresources/center/urbangreening/parks/

The Trust for Public Lands/Center for City Park Excellence
www.tpl.org/research

The Trust for Public Lands/ Center for City Park Excellence Bibliography
http://www.tpl.org/research/parks/selected-readings-ccpe.html 

Informative Links Regarding Nature Play and Playground Safety

Colorado State Best Practices
http://www.colorado.gov/cs/Satellite/Best-Practices-V2/BPV/1216461738890

US Consumer Product Safety Commission (CPSC) Public Playground Safety Checklist
http://www.cpsc.gov/cpscpub/pubs/327.html

CPSC Playground Safety Publications
http://www.cpsc.gov/cpscpub/pubs/playpubs.html

KaBoom: Take Action for Play
http://kaboom.org/take_action/playful_city_usa/best_practices_play

Standard Guide for ASTM Standards on Playground Surfacing
http://www.astm.org/Standards/F2223.htm

Safe Kids USA
http://www.safekids.org/our-work/research/fact-sheets/playground-safety-fact-sheet.html

NRPA Playground Safety
http://www.nrpa.org/playgroundsafety/

NRPA Certified Playground Safety Inspector Registry
https://ipv.nrpa.org/CPSI_registry/default.aspx

University of the District Columbia Extension: Playground Safety
http://www.extension.org/pages/32415/playground-safety