TY  - BOOK
AU  - Iligan, Zenaida C.
TI  - Demo lesson in mathematics three
SN  - 2094-8042
U1  - DPer 370.105 M72 Jan-Dec 2011 v59-60  
PY  - 2011///
CY  - Philippines: 
PB  - In the Grade School, Inc., 
KW  - Programmed instruction
KW  - Mathematics
ER  -