W. W. Hartup

Social isolation vs interaction with adults in relation to aggression in preschool children.

W. W. Hartup, Y. Himeno, 1959, Journal of abnormal psychology.

Mailed versus supervised administration of a projective questionnaire.

W. W. Hartup, R. Q. Bell, D. H. Crowell, 1962, Journal of consulting psychology.

AVOIDANCE OF INAPPROPRIATE SEX-TYPING BY YOUNG CHILDREN.

S. Moore, W. W. Hartup, G. Sager, 1963, Journal of consulting psychology.

Sex-role preferences in three and four-year-old children.

W. W. Hartup, E. Zook, 1960, Journal of consulting psychology.

The Dynamics of Preschool Children's Conflicts.

B. Laursen, W. W. Hartup, 1989 .