HOPKINS, J. A. Farm Records And Accounting John A. Hopkins And Earl O. Heady. Iowa State University Press.
Čikaški stil citiranja (17. izdanje)HOPKINS, John A. Farm Records And Accounting John A. Hopkins And Earl O. Heady. Iowa State University Press.
MLA način citiranja (8. izdanje)HOPKINS, John A. Farm Records And Accounting John A. Hopkins And Earl O. Heady. Iowa State University Press.
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