Bentzen, W. R. (2009). Seeing young children: A guide to observing and recording behavior (6th ed.). Thomson/Delmar Learning.
Lua i Stíl Chicago (17ú heag.)Bentzen, Warren R. Seeing Young Children: A Guide to Observing and Recording Behavior. 6th ed. Clifton Park, N.Y: Thomson/Delmar Learning, 2009.
Lua MLA (9ú heag.)Bentzen, Warren R. Seeing Young Children: A Guide to Observing and Recording Behavior. 6th ed. Thomson/Delmar Learning, 2009.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.