Sawyers, J., Rogers, C. Helping Young Children Develop Through Play. Washington: National Association for the Education of Young Children, 1988 60 с. : със сн. 0-935989-24-2.
Sawyers, J., Rogers, C. Helping Young Children Develop Through Play. Washington: National Association for the Education of Young Children, 1988 60 с. : със сн. 0-935989-24-2.
Sawyers, J., Rogers, C. (1988) Helping Young Children Develop Through Play, Washington: National Association for the Education of Young Children 60 с. : със сн. 0-935989-24-2.
Sawyers, J., & Rogers, C. (1988). Helping Young Children Develop Through Play. A Practical Guide for Parents, Caregivers, and Teachers. Washington: National Association for the Education of Young Children, 60 с. : със сн.
Sawyers J, Rogers C. Helping Young Children Develop Through Play: A Practical Guide for Parents, Caregivers, and Teachers. Washington: National Association for the Education of Young Children; 1988. p. 60 с. : със сн. ISBN: 0-935989-24-2.