Kumar, G. W. W. a. R. Options for developing countries in mining development. Macmillan Press.
Lua i Stíl Chicago (17ú heag.)Kumar, Grantley W. Walrond and Raj. Options for Developing Countries in Mining Development. Macmillan Press.
Lua MLA (8ú heag.)Kumar, Grantley W. Walrond and Raj. Options for Developing Countries in Mining Development. Macmillan Press.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.