Harada, K., Oka, K., Ota, A., Shibata, A., & Nakamura, Y. (2008). Prevalence and correlates of strength training among japanese adults: Analysis of the SSF National Sports-Life Survey 2006. International journal of sport and health science, 6, S. 66-71. doi:10.5432/ijshs.6.66

Harada, Kazuhiro, Koichiro Oka, Akemi Ota, Ai Shibata, and Yoshio Nakamura. "Prevalence and Correlates of Strength Training Among Japanese Adults: Analysis of the SSF National Sports-Life Survey 2006." International Journal of Sport and Health Science 6 (2008): S. 66-71.

Harada, Kazuhiro, et al. "Prevalence and Correlates of Strength Training Among Japanese Adults: Analysis of the SSF National Sports-Life Survey 2006." International Journal of Sport and Health Science 6 (2008): S. 66-71.