Sluss, D. J. (2005). Supporting play: Birth through age eight. Thomson/Delmar Learning.
Lua i Stíl Chicago (17ú heag.)Sluss, Dorothy Justus. Supporting Play: Birth Through Age Eight. Clifton Park, N.Y: Thomson/Delmar Learning, 2005.
Lua MLA (9ú heag.)Sluss, Dorothy Justus. Supporting Play: Birth Through Age Eight. Thomson/Delmar Learning, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.