TY  - BOOK
AU  - Heinich, Robert et al; Wiley, John; Molenda, Michael & Russell, James D.
TI  - Instrunctional media: and the new technologies of instruction
SN  - 0-471-89147-9
U1  - 371.3078 Hei 
PY  - 1982///
CY  - John Wileu & Sons, New York
ER  -