TY  - BOOK
AU  - Wittich,Walter A.
AU  - Schuller,Francis Charles
TI  - Audio-visual materials: their nature and use 
PY  - 1953///
CY  - New York
PB  - Harpar and Brothers Pub.
KW  - Audio-visual education
KW  - Education
N1  - Includes index
ER  -