[Washington U.S. Dept. of Health, Education, and Welfare, Office of Human Development, Office of Child Development, Children's Bureau 1976 .
iii, 64 p. , Cover title. | Prepared by U. Gallagher and S.N. Katz. 26 cm..

By Sariego Morillo, José Luis..
Madrid Tecnos 2000 .
100 p. , Rústica. 18 cm..
8430935150