Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Gelman, Rochel, y C. R. Gallistel. The Child's Understanding of Number. Cambridge (Massachusetts) [etc.]: Harvard University Press, 1978.

Cita MLA (9a ed.)

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