APA-viite (7. p.)
Porter, G. R. (1851). The Progress of the nation in its various social and economical relations.
Chicago-viite (17. p.)
Porter, George Richardson. The Progress of the Nation in Its Various Social and Economical Relations. London, 1851.
MLA-viite (9. p.)
Porter, George Richardson. The Progress of the Nation in Its Various Social and Economical Relations. 1851.
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