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Mackintosh, Kelly, Catherine A. Sharp, Mihela Erjavec, Duncan M. Pascoe, and Pauline J. Horne. "Validity and Reliability of the Fitbit Zip As a Measure of Preschool Children’s Step Count." BMJ Open Sport & Exercise Medicine 3, no. 1 (2017): e000272.

Mackintosh, Kelly, et al. "Validity and Reliability of the Fitbit Zip As a Measure of Preschool Children’s Step Count." BMJ Open Sport & Exercise Medicine 3.1 (2017): e000272.