TY  - GEN
AU  - Laurif A.P.
TI  - Encyclopedia of educational research: theory, method, practice, history and development of education at home and abroad
SN  - 8170411955
U1  - 370.18 LAU 5 
PY  - 1989///.
CY  - Delhi : 
PB  - Anmol Publications, 
KW  - Elementary schools
KW  - Open-air schools--Germany
ER  -