TY  - BOOK
AU  - Hass, Kenneth B., Packer, Harry Q. and Kuhn, Bert Paul
TI  - Preparation and use of audio-visual aids
U1  - 371.3 
PY  - 1955///
CY  - England
PB  - ; Prentice Hall
KW  - Education
KW  - Method Of Instruction
ER  -