Satvir Singh. (1981). Third All-India Educational Survey, pre-primary schools. National Council of Educational Research and Training.
Lua i Stíl Chicago (17ú heag.)Satvir Singh. Third All-India Educational Survey, Pre-primary Schools. New Delhi: National Council of Educational Research and Training, 1981.
Lua MLA (8ú heag.)Satvir Singh. Third All-India Educational Survey, Pre-primary Schools. National Council of Educational Research and Training, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.