Greenhalgh, C., Gregory, M., & Barrell, R. (2000). Labour Productivity and Product Quality: Their Growth and Inter-industry Transmission in the UK 1979-1990. Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Greenhalgh, C., M. Gregory, agus R. Barrell. Labour Productivity and Product Quality: Their Growth and Inter-industry Transmission in the UK 1979-1990. Cambridge University Press, 2000.
Lua MLA (9ú heag.)Greenhalgh, C., et al. Labour Productivity and Product Quality: Their Growth and Inter-industry Transmission in the UK 1979-1990. Cambridge University Press, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.