JOHNSTON, J. (1972). Econometric Methods / J. Johnston. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)JOHNSTON, J. Econometric Methods / J. Johnston. McGraw-Hill, 1972.
Lua MLA (8ú heag.)JOHNSTON, J. Econometric Methods / J. Johnston. McGraw-Hill, 1972.
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