TY  - BOOK
AU  - Wragg, E.C.
AU  - Brown, George (jt.auth)
TI  - Explaining
SN  - 0-415-08387-7
U1  - 371.3 
PY  - 1993///
CY  - London
PB  - Routledge
KW  - Instructional systems-Design-Case studies
N1  - Includes bibliography
ER  -