TY  - BOOK
AU  - Gerlach, Vernon S.
AU  - Gerlach, Vernon S.
TI  - Teaching and media: a systematic approach
SN  - 13 891333 1
U1  - 371. 3 
PY  - 1971///
CY  - Englewood Cliffs
PB  - Prentice Hall
ER  -