Social class and sex differences in the attachment and play behavior of the year-old infant
By: Stanley B. Messer and Michael Lewis
Contributors: Lewis, Michael, 1937 January 10-
Series: Research bulletin -- 70-13; Research bulletin (Educational Testing Service) -- RB-70-13
Publisher: Educational Testing Service
Published: 1970
Place of publication: Princeton, N.J
Language: eng
Number of pages: 18
Subjects: Child development; Sex differences
Notes: "February 1970."

"This bulletin is a draft for interoffice circulation ..."

Includes bibliographical references (leaves 13-15).