TY  - BOOK
AU  - Mager,Robert F.
TI  - Preparing instructional objectives
SN  - 0749405945
PY  - 1991///
CY  - London
PB  - Kogan Page
KW  - Programmed instruction
N1  - First ed. published in 1961 under title: Preparing objectives for Programmed instruction
ER  -