Não informado. (1968). Research Results Digest. National Cooperative Highway Research Program.
Lua i Stíl Chicago (17ú heag.)Não informado. Research Results Digest. Washington: National Cooperative Highway Research Program, 1968.
Lua MLA (8ú heag.)Não informado. Research Results Digest. National Cooperative Highway Research Program, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.