FERBER, R. (1967). Research Methods In Economis And Business Robert Ferber And P.j. Verdoorn. Macmillan Co.
Lua i Stíl Chicago (17ú heag.)FERBER, Robert. Research Methods In Economis And Business Robert Ferber And P.j. Verdoorn. Macmillan Co, 1967.
Lua MLA (8ú heag.)FERBER, Robert. Research Methods In Economis And Business Robert Ferber And P.j. Verdoorn. Macmillan Co, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.