National Research Council (U.S.). Panel to Review the Status of Basic Research on School-Age Children & Collins, W. A. (1984). Development during middle childhood: The years from six to twelve. National Academy Press.

National Research Council (U.S.). Panel to Review the Status of Basic Research on School-Age Children and W. Andrew Collins. Development During Middle Childhood: The Years from Six to Twelve. Washington, D.C.: National Academy Press, 1984.

National Research Council (U.S.). Panel to Review the Status of Basic Research on School-Age Children and W. Andrew Collins. Development During Middle Childhood: The Years from Six to Twelve. National Academy Press, 1984.