Arnold, Roger A. Principles of microeconomics / Roger A. Arnold - 10th ed. - Australia ; Mason, OH : South-Western, Cengage Learning, c2011. - xxxiii, 524 p. : ill. ; 27 cm. ISBN: 9780538470742 LCCN: Subjects--Topical Terms: Economics LC Class. No.: HB172.5 / .A76 2011