TY  - BOOK
AU  - Bretz,Rudy
TI  - A texonomy of communication media
SN  - 0877780129
U1  - 302.23/B845t 
PY  - 1971///, 1972
CY  - Englewood Cliffs, New Jersey
PB  - Educational Technology publ.
KW  - Mass media
KW  - communication
ER  -