Trost, S., Pate, R., Freedson, P., Sallis, J., & Taylor, W. (2000). Using objective physical activity measures with youth: How many days of monitoring are needed? Medicine and science in sports and exercise, 32(2), S. 426-431.

Trost, S.G., R.R Pate, P.S Freedson, J.F Sallis, and W.C Taylor. "Using Objective Physical Activity Measures With Youth: How Many Days of Monitoring Are Needed?" Medicine and Science in Sports and Exercise 32, no. 2 (2000): S. 426-431.

Trost, S.G., et al. "Using Objective Physical Activity Measures With Youth: How Many Days of Monitoring Are Needed?" Medicine and Science in Sports and Exercise 32.2 (2000): S. 426-431.