Bee, H. The developing child. Harper Collins College.
Lua i Stíl Chicago (17ú heag.)Bee, Helen. The Developing Child. Harper Collins College.
Lua MLA (8ú heag.)Bee, Helen. The Developing Child. Harper Collins College.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.