Narayanan, P. I. A., & Subrahmanyan, N. N. (1959). Beneficiation of low grade manganese ores of India. Council of Scientific & Industrial Research.
Lua i Stíl Chicago (17ú heag.)Narayanan, P. I. A., agus N. N. Subrahmanyan. Beneficiation of Low Grade Manganese Ores of India. New Delhi: Council of Scientific & Industrial Research, 1959.
Lua MLA (8ú heag.)Narayanan, P. I. A., agus N. N. Subrahmanyan. Beneficiation of Low Grade Manganese Ores of India. Council of Scientific & Industrial Research, 1959.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.