HUMPHREYS , K. (1991). JELENS COST AND OPTIMIZATION ENGINEERING. MCGRAW HILL.
Lua i Stíl Chicago (17ú heag.)HUMPHREYS , K.K. JELENS COST AND OPTIMIZATION ENGINEERING. NEW-YORK: MCGRAW HILL, 1991.
Lua MLA (9ú heag.)HUMPHREYS , K.K. JELENS COST AND OPTIMIZATION ENGINEERING. MCGRAW HILL, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.