Chowdhury, P. N. (1973). Economics of research & development. People's Pub. House.
Lua i Stíl Chicago (17ú heag.)Chowdhury, P. N. Economics of Research & Development. New Delhi: People's Pub. House, 1973.
Lua MLA (8ú heag.)Chowdhury, P. N. Economics of Research & Development. People's Pub. House, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.