TY  - BOOK
AU  - Alden,Jay
TI  - Backward chaining: teaching task performance 
SN  - 0877781109
AV  - LB1027 .A42
U1  - 371.3 
PY  - 1978///
CY  - Englewood Cliffs, N.J.
PB  - Educational Technology Publications
KW  - Activity programs in education
N1  - Bibliography: p.67-69
ER  -