APA-čujuhus (7. p.)
Harford, T. The Next Fifty Things That Made the Modern Economy. The Bridge Street Press.
Chicago-čujuhus (17. p.)
Harford, Tim. The Next Fifty Things That Made the Modern Economy. Londres, Inglaterra: The Bridge Street Press.
MLA-čujuhus (9. p.)
Harford, Tim. The Next Fifty Things That Made the Modern Economy. The Bridge Street Press.
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