TY  - BOOK
AU  - Thomas,R.Murray
ED  - UNESCO
ED  - UNICEF
ED  - WFP. Programa de Alimentación Mundial.
TI  - An Instructional model for studying cognitive development and readability of instructional materials: guidelines for evaluation 
PY  - 1980///
CY  - Paris, New York, Rome
PB  - UNESCO, UNICEF, WFP
ER  -