Berk, L. E. (1989). Child development. Allyn and Bacon.
Lua i Stíl Chicago (17ú heag.)Berk, Laura E. Child Development. Boston: Allyn and Bacon, 1989.
Lua MLA (9ú heag.)Berk, Laura E. Child Development. Allyn and Bacon, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.