Greene, M., & Shorter, P. (2012). Building conceptual understanding in precalculus. Transformative Dialogues: Teaching & Learning Journal, 6(2), 1-16. Retrieved from http://www.kpu.ca/sites/default/files/TD.6.2.2_Greene%26Shorter_Conceptual_Understanding_in_Precalculus.pdf
Numerous studies have replicated these results utilizing the same methods (Greene & Shorter, 2012).
Delgado, J. (2014, June 2). Work to begin on Grant Park skate park. TheChicago Tribune. Retrieved from http://www.chicagotribune.com/news/local/ct-grant-park-new-skate-park-met-20140602,0,2192644.story
Numerous studies have replicated these results utilizing the same methods (Delgado, 2014).