TY  - BOOK
AU  - Heinch, Robert,  Molenda, Michael,  Russell, James D
TI  - Instructional media : and the new technologies of instruction
SN  - 0-02-353060-x
U1  - 371.3078 Hei 
PY  - 1993///
CY  - Macmillan Publishing co, New York
ER  -