Cita APA (7th ed.)

Leach, P. Babyhood: Infant development from birth to two years. Penguin Books.

Cita Chicago (17th ed.)

Leach, Penelope. Babyhood: Infant Development from Birth to Two Years. Harmondsworth: Penguin Books.

Cita MLA (9th ed.)

Leach, Penelope. Babyhood: Infant Development from Birth to Two Years. Penguin Books.