TY  - BOOK
AU  - Wittich,Walter Arno
AU  - Schuller,Charles Francis
TI  - Audiovisual materials : their nature and use: their nature and use
PY  - 1962///
CY  - New York : 
PB  - Harper & Row, 
KW  - Material Audiovisual
KW  - Enseñanza Audiovisual
KW  - Multimedios
ER  -