Cita APA (7th ed.)

Gelman, R., & Gallistel, C. R. (1978). The child's understanding of number. Harvard University Press.

Cita Chicago (17th ed.)

Gelman, Rochel, i C. R. Gallistel. The Child's Understanding of Number. Cambridge, MA: Harvard University Press, 1978.

Cita MLA (9th ed.)

Gelman, Rochel, i C. R. Gallistel. The Child's Understanding of Number. Harvard University Press, 1978.