Não informado. (1970). Copper abstracts. International Copper Development Council.
Lua i Stíl Chicago (17ú heag.)Não informado. Copper Abstracts. Geneva, Suíça: International Copper Development Council, 1970.
Lua MLA (8ú heag.)Não informado. Copper Abstracts. International Copper Development Council, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.