Gaya APA

Kritchevsky, S. et al (1969). Planning Environments for Young Children : PHYSICAL SPACE . Washington, DC: National Assocition for the Education of Young Children.

Gaya MLA

Kritchevsky, Sybil. et al. "Planning Environments for Young Children : PHYSICAL SPACE". Washington, DC: National Assocition for the Education of Young Children, 1969. Text.