Hart, P., & Clarke, R. (1980). Concentration in British industry 1935-75: A study of the growth, causes and effects of concentration in British manufacturing industries. Cambridge University Press.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিHart, P.E, এবং R.;Hart Clarke. Concentration in British Industry 1935-75: A Study of the Growth, Causes and Effects of Concentration in British Manufacturing Industries. Cambridge University Press, 1980.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিHart, P.E, এবং R.;Hart Clarke. Concentration in British Industry 1935-75: A Study of the Growth, Causes and Effects of Concentration in British Manufacturing Industries. Cambridge University Press, 1980.
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