Não informado. (1950). Operational Research Quarterly. Operational Research Club.
Lua i Stíl Chicago (17ú heag.)Não informado. Operational Research Quarterly. London: Operational Research Club, 1950.
Lua MLA (8ú heag.)Não informado. Operational Research Quarterly. Operational Research Club, 1950.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.