Não informado. (1961). Operations Research/Management Science. Executive Sciences Institute.
Lua i Stíl Chicago (17ú heag.)Não informado. Operations Research/Management Science. Davenport, Iowa: Executive Sciences Institute, 1961.
Lua MLA (8ú heag.)Não informado. Operations Research/Management Science. Executive Sciences Institute, 1961.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.