TY  - BOOK
AU  - Gerlach,Vernon S.
AU  - Ely,Donald P.
TI  - Teaching and media: a systematic approach 
SN  - 0138913331
PY  - 1971///
CY  - Englewood Cliffs, N.J.
PB  - Prentice-Hall
KW  - Audio
KW  - Visual education
KW  - Teaching
KW  - Aids and devices
N1  - Includes bibliographical references
ER  -