TY  - BOOK
AU  - Haas, Kenneth Brooks,
AU  - Packer, Harry Q.
ED  - 
ED  - 
ED  - 
ED  - 
SN  - 2
PY  - 1955///46
CY  - New York
PB  - Prentice-Hall
KW  - 
KW  - 2
KW  - 0
KW  - 6
KW  - 20
KW  - Audio-visual education
N1  - 5
ER  -