Operations Research Society of America. (1981). Operations Research Letters. North Holland Publishing.
Lua i Stíl Chicago (17ú heag.)Operations Research Society of America. Operations Research Letters. Amsterdam: North Holland Publishing, 1981.
Lua MLA (8ú heag.)Operations Research Society of America. Operations Research Letters. North Holland Publishing, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.