APA (7th ed.) Citation

Sigel, I. E., Hooper, F. H., & Piaget, J. (1968). Logical thinking in children: Research based on Piaget's theory. Holt, Rinehart and Winston.

Chicago Style (17th ed.) Citation

Sigel, Irving E., Frank H. Hooper, and Jean Piaget. Logical Thinking in Children: Research Based on Piaget's Theory. New York: Holt, Rinehart and Winston, 1968.

MLA (9th ed.) Citation

Sigel, Irving E., et al. Logical Thinking in Children: Research Based on Piaget's Theory. Holt, Rinehart and Winston, 1968.