@article{Guo2020,
author = {Guo, Y. and Chen, Q. and Zhai, S. and Pei, C.},
title= {Does private tutoring improve student learning in China? Evidence from the China Education Panel Survey},
year = {2020},
doi = {10.1002/app5.310},
volume = {7},
number = {3},
pages = {322--343},
}