FERBER, R. (1967). Research Methods In Economis And Business Robert Ferber And P.j. Verdoorn. Macmillan Co.
Čikaški stil citiranja (17. izdanje)FERBER, Robert. Research Methods In Economis And Business Robert Ferber And P.j. Verdoorn. Macmillan Co, 1967.
MLA način citiranja (8. izdanje)FERBER, Robert. Research Methods In Economis And Business Robert Ferber And P.j. Verdoorn. Macmillan Co, 1967.
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