TY  - GEN
AU  - Ratnapala, Nandasena
TI  - Samaja vidya paryeshana mooladharma
PY  - 1980///
CY  - Mt. Lavinia
PB  - Sarvodaya Paryeshana Ayathanaya
KW  - SOCIAL SCIENCES
N1  - Bound photocopy ; text in Sinhala
ER  -