TY  - BOOK
AU  - Gray,William A.
AU  - Gerrard,Brian A.
TI  - Learning by doing: developing teaching skill 
SN  - 0201025477
PY  - 1977///
CY  - Reading, Mass.
PB  - Addison-Wesley
KW  - Activity programs in education
N1  - Bibliography: p. 406-409
ER  -