TY  - BOOK
AU  - Gerlach, Vernon S.
AU  - Ely, Donald P.
TI  - Teaching & Media : a systematic approach
SN  - 0138913587
U1  - 407.35 
PY  - 1980///
CY  - New jersey
PB  - Prentice Hall
KW  - English Language
ER  -