Lumsden, Keith G. Microeconomics : a programmed book / Keith Lumsden, Richard Attiyeh, George Leland Bach. - 4th ed. - Englewood Cliffs, N.J. : Prentice-Hall, c1982. - ix, 262 p. : ill. ; 23 cm. ISBN: 0135813972 (pbk.) LCCN: 81011860 LC Class. No.: HB172 .L95 1982 / .L95 1982 Dewey Class. No.: 338.5/07/7