na INLIS000000000010743 20210426121755 210426||||||||| | ||| |||| || | 637182274 010-0421010743 id 330.101.542 330.101.542 RUF p RUFFIN, Roy J. GREGORY, Paul R. Principles of microeconomics 2nd.ed. London Scott, Foresman and Company 1986 xxix,508p;ills; 25cm Ekonomi -- Ekonomi mikro