Srī Laṅkā Maha Băṅkuva. Ārtika Paryēṣana Depārtamēntuva & Perera, G. A. S. (1974). Report on the sample survey of labour force participation rates in Sri Lanka, 1973. Economic Research Dept., Central Bank of Ceylon.
Lua i Stíl Chicago (17ú heag.)Srī Laṅkā Maha Băṅkuva. Ārtika Paryēṣana Depārtamēntuva agus G. A. S. Perera. Report on the Sample Survey of Labour Force Participation Rates in Sri Lanka, 1973. Colombo: Economic Research Dept., Central Bank of Ceylon, 1974.
Lua MLA (8ú heag.)Srī Laṅkā Maha Băṅkuva. Ārtika Paryēṣana Depārtamēntuva agus G. A. S. Perera. Report on the Sample Survey of Labour Force Participation Rates in Sri Lanka, 1973. Economic Research Dept., Central Bank of Ceylon, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.