Herens, M. C., van Ophem, J. A. C., Wagemakers, A. M. A. E., & Koelen, M. A. (2015). Predictors of willingness to pay for physical activity of socially vulnerable groups in community-based programs. Springerplus.
Citação norma ChicagoHerens, Marion C., Johan A. C. van Ophem, Annemarie M. A. E. Wagemakers, and Maria A. Koelen. "Predictors of Willingness to Pay for Physical Activity of Socially Vulnerable Groups in Community-based Programs." Springerplus 2015.
MLA引文Herens, Marion C., Johan A. C. van Ophem, Annemarie M. A. E. Wagemakers, and Maria A. Koelen. "Predictors of Willingness to Pay for Physical Activity of Socially Vulnerable Groups in Community-based Programs." Springerplus 2015.
警告：這些引文格式不一定是100％准確.