Não informado. (1988). 21st. Century science & technology. 21st. Century Science Associates.
Lua i Stíl Chicago (17ú heag.)Não informado. 21st. Century Science & Technology. Washington: 21st. Century Science Associates, 1988.
Lua MLA (8ú heag.)Não informado. 21st. Century Science & Technology. 21st. Century Science Associates, 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.