Sarah Edwards (2003). "School linking: an introduction". Citizenship in Action. Heinemann. ISBN0435808044. Unknown parameter |isbn13= ignored (bantuan)
Art Petty and Rich Petro (2007). Practical Lessons in Leadership: A Guidebook for Aspiring and Experienced Leaders. Trafford Publishing. m/s. 191. ISBN1425122493. Unknown parameter |isbn13= ignored (bantuan)
Stuar J.H. Biddle and Panteleimon Ekkekakis (2005). "Physically active lifestyles and well-being". Dalam Felicia A. Huppert, Nick Baylis, and Barry Keverne (penyunting). The Science of Well-being. Oxford University Press. m/s. 161. ISBN0198567529. Unknown parameter |isbn13= ignored (bantuan)CS1 maint: multiple names: editors list (link)
