TY  - JOUR
A1  - Zhang, Y.
A1  - Dang, Y.
A1  - He, Y.
A1  - Ma, X.
A1  - Wang, L.
T1  - Is private supplementary tutoring effective? A longitudinally detailed analysis of private tutoring quality in China
Y1  - 2021
DO  - 10.1007/s12564-021-09671-3
VL  - 22
IS  - 2

ER  -