AU  - Ratnayake, M.
TI  - Growth and problems of world population and Sri Lanka (in Sinhala)
T2  - Science Education Series
CY  - NARESA
PB  - Colombo
KW  - Education
KW  - Population
N1  - http://thakshana.nsf.ac.lk/slstic/NA-128/NA_128.pdf
ER  -