Walker, D. H. (1996). Planning For Control In The Construction Industry Derek H.t Walker. Informit Electronic Publishing.
Lua i Stíl Chicago (17ú heag.)Walker, Derek H.T. Planning For Control In The Construction Industry Derek H.t Walker. Informit Electronic Publishing, 1996.
Lua MLA (8ú heag.)Walker, Derek H.T. Planning For Control In The Construction Industry Derek H.t Walker. Informit Electronic Publishing, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.