TY  - BOOK
AU  - Ibarrientos, Catherine A. 
TI  - Problem-solving difficulties in grade 8 physical science : : basis for the development of instructional materials 
U1  - TH 500.2 Ib1p 2020 
PY  - 2020///
CY  - Luna Colleges, Inc., 
PB  - [s.n.], 
KW  - Physical sciences
N1  - References: pages 50-52
ER  -