Drewin, F. (1982). Construction Productivity: Measurement And Improvement Through Work Study / F.j. Drewin. Elsevier.
Lua i Stíl Chicago (17ú heag.)Drewin, F.J. Construction Productivity: Measurement And Improvement Through Work Study / F.j. Drewin. Elsevier, 1982.
Lua MLA (8ú heag.)Drewin, F.J. Construction Productivity: Measurement And Improvement Through Work Study / F.j. Drewin. Elsevier, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.