WAH, L. S. (1994). Iso 9000 In Construction. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)WAH, LAM SIEW. Iso 9000 In Construction. McGraw-Hill, 1994.
Lua MLA (8ú heag.)WAH, LAM SIEW. Iso 9000 In Construction. McGraw-Hill, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.