Birth order and sibship sex composition as instruments in the study of education and earnings /
Gary-Bobo, Robert.
Prieto, Ana.
Picard, Natalie.
Centre for Economic Policy Research (Great Britain)
London : Centre for Economic Policy Research,
2006.
"Public policy."
Includes bibliographical references (p. 15-16).
Also available from the CEPR World Wide Web site (www.cepr.org).