Não informado. (1956). Cost engineering. Industrial Research Service.
Lua i Stíl Chicago (17ú heag.)Não informado. Cost Engineering. Dover, N.H: Industrial Research Service, 1956.
Lua MLA (8ú heag.)Não informado. Cost Engineering. Industrial Research Service, 1956.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.