University of Minnesota. Institute of Child Development, ebrary, Inc, Hill, J. P., Pick, A. D., & Collins, W. A. (1973). Minnesota Symposia on Child Psychology: [papers of the annual symposia, 1966-1977, i.e. 1976]. Vol. 7. University of Minnesota Press.

University of Minnesota. Institute of Child Development, Inc ebrary, John P. Hill, Anne D. Pick, and W. Andrew Collins. Minnesota Symposia on Child Psychology: [papers of the Annual Symposia, 1966-1977, I.e. 1976]. Vol. 7. Minneapolis [Minn.]: University of Minnesota Press, 1973.

University of Minnesota. Institute of Child Development, et al. Minnesota Symposia on Child Psychology: [papers of the Annual Symposia, 1966-1977, I.e. 1976]. Vol. 7. University of Minnesota Press, 1973.