Ronquillo, C. V. U. (1998). The development of the concept of time in young children.
Lua i Stíl Chicago (17ú heag.)Ronquillo, Carolyn Victoria Uy. The Development of the Concept of Time in Young Children. 1998.
Lua MLA (9ú heag.)Ronquillo, Carolyn Victoria Uy. The Development of the Concept of Time in Young Children. 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.