Leach, P. Babyhood: Infant development from birth to two years. Penguin Books.
Lua i Stíl Chicago (17ú heag.)Leach, Penelope. Babyhood: Infant Development from Birth to Two Years. Harmondsworth: Penguin Books.
Lua MLA (9ú heag.)Leach, Penelope. Babyhood: Infant Development from Birth to Two Years. Penguin Books.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.