Rugg, H. O. (1926). Resources, industries and cities of America. Lincoln School.
Čikaški stil citiranja (17. izdanje)Rugg, Harold Ordway. Resources, Industries and Cities of America. [New York: Lincoln School, 1926.
MLA način citiranja (9. izdanje)Rugg, Harold Ordway. Resources, Industries and Cities of America. Lincoln School, 1926.
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