APA استشهاد

Yuqing Hu, X. L. (2012). Effects of Social Activities on Cognitive Functions: Evidence from CHARLS. THE NATIONAL ACADEMIES PRESS.

استشهاد بنمط شيكاغو

Yuqing Hu, Xiaoyan Lei. Effects of Social Activities on Cognitive Functions: Evidence from CHARLS. Washington: THE NATIONAL ACADEMIES PRESS, 2012.

MLA استشهاد

Yuqing Hu, Xiaoyan Lei. Effects of Social Activities on Cognitive Functions: Evidence from CHARLS. THE NATIONAL ACADEMIES PRESS, 2012.