GRAY, A. S. The development of economic doctrine#An introductory survey#Alexander Gray. Longanns Northumberland Press.
Lua i Stíl Chicago (17ú heag.)GRAY, Alexander Sir. The Development of Economic Doctrine#An Introductory Survey#Alexander Gray. Longanns Northumberland Press.
Lua MLA (8ú heag.)GRAY, Alexander Sir. The Development of Economic Doctrine#An Introductory Survey#Alexander Gray. Longanns Northumberland Press.
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