TY  - BOOK
AU  - Wittich,Walter Arno
TI  - Audio-visual materials: their nature and use
U1  - 371.335 
PY  - 1953///
CY  - 
PB  - Harper and Brothers.
KW  - MEDIOS AUDIOVISUALES
N1  - Bibl., apéndice; índice
ER  -