TY  - BOOK
AU  - Colvin, Ralph W. and Zaffiro, Esther M.
TI  - Preschool education: A handbook for the training of early childhood educators
SN  - 0-8261-1620-5
U1  - 372.21 Col/Zaf 
PY  - 1974///
CY  - Springer publishing house, New York
ER  -