TY  - BOOK
AU  - Vella,Jane Kathryn
TI  - Visual aids for nonformal education : : A field guide to the production and use of inexpensive visual aids in nonformal education / 
SN  - 0932288537 (pb)
PY  - 1979///
CY  - Massachusetts : 
PB  - Center for International Education, 
N1  - Includes bibliography
ER  -