National Bituminous Concrete Association (U.S.). Quality Improvement Program. (1961). QUIPS: Quality Improvement Program synopsis. National Bituminous Concrete Association.
Lua i Stíl Chicago (17ú heag.)National Bituminous Concrete Association (U.S.). Quality Improvement Program. QUIPS: Quality Improvement Program Synopsis. College Station, Tex.: National Bituminous Concrete Association, 1961.
Lua MLA (8ú heag.)National Bituminous Concrete Association (U.S.). Quality Improvement Program. QUIPS: Quality Improvement Program Synopsis. National Bituminous Concrete Association, 1961.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.