Brown, G. A., Cook, C. M., Krueger, R. D., & Heelan, K. A. (2010). Comparison of energy expenditure on a treadmill vs. an elliptical device at a self-selected exercise intensity. Journal of strength and conditioning research, 24(6), S. 1643-1649. doi:10.1519/JSC.0b013e3181cb2854

Brown, Gregory A., Chad M. Cook, Ryan D. Krueger, and Kate A. Heelan. "Comparison of Energy Expenditure On a Treadmill Vs. an Elliptical Device At a Self-selected Exercise Intensity." Journal of Strength and Conditioning Research 24, no. 6 (2010): S. 1643-1649.

Brown, Gregory A., Chad M. Cook, Ryan D. Krueger, and Kate A. Heelan. "Comparison of Energy Expenditure On a Treadmill Vs. an Elliptical Device At a Self-selected Exercise Intensity." Journal of Strength and Conditioning Research 24.6 (2010): S. 1643-1649.