Wegerich, A., & O'Rourke, K. (2016). Digging Deeper: Global Coal Prices and Industrial Growth, 1840-1960.
Čikaški stil citiranja (17. izdanje)Wegerich, A., i K. O'Rourke. Digging Deeper: Global Coal Prices and Industrial Growth, 1840-1960. 2016.
MLA način citiranja (9. izdanje)Wegerich, A., i K. O'Rourke. Digging Deeper: Global Coal Prices and Industrial Growth, 1840-1960. 2016.
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