Wooldridge, Jeffrey M., 1960- Introductory econometrics : a modern approach / Jeffrey M. Wooldridge. - 4th ed. - Mason, OH : Thomson/South-Western, c2009. - xxii, 890 p. : ill. ; 24 cm. Includes bibliographical references (p. 854-858) and index. ISBN: 0324788908 9780324788907 LCCN: 2008921832 Subjects--Topical Terms: Econometrics. LC Class. No.: HB139 / .W665 2006 Dewey Class. No.: 330.015195 / WJI