Roberts, J. (1973). Civilization: Volume II/Journey to the modern world. CRM books.
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Chicago-čujuhus (17. p.)
Roberts, John. Civilization: Volume II/Journey to the Modern World. California: CRM books, 1973.
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MLA-čujuhus (9. p.)
Roberts, John. Civilization: Volume II/Journey to the Modern World. CRM books, 1973.
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