Essa, E. (1999). Introduction to early childhood education (3rd ed.). Delmar.
Lua i Stíl Chicago (17ú heag.)Essa, Eva. Introduction to Early Childhood Education. 3rd ed. Albany, N.Y: Delmar, 1999.
Lua MLA (9ú heag.)Essa, Eva. Introduction to Early Childhood Education. 3rd ed. Delmar, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.