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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Greenhalgh, C., M. Gregory, و R. Barrell. Labour Productivity and Product Quality: Their Growth and Inter-industry Transmission in the UK 1979-1990. Cambridge University Press, 2000.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Greenhalgh, C., et al. Labour Productivity and Product Quality: Their Growth and Inter-industry Transmission in the UK 1979-1990. Cambridge University Press, 2000.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.