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Yu, Chen-an, Peter C. Rouse, Jet JCS Veldhuijzen Van Zanten, Nikos Ntoumanis, George D. Kitas, Joan L. Duda, và George S. Metsios. "Subjective and Objective Levels of Physical Activity and Their Association With Cardiorespiratory Fitness in Rheumatoid Arthritis Patients." Arthritis Res Ther 2015.

Yu, Chen-an, et al. "Subjective and Objective Levels of Physical Activity and Their Association With Cardiorespiratory Fitness in Rheumatoid Arthritis Patients." Arthritis Res Ther 2015.