Pickett, L. H., & Boren, D. (1923). Early childhood education. World book company.
Lua i Stíl Chicago (17ú heag.)Pickett, Lalla H., agus Duralde Boren. Early Childhood Education. Yonkers-on-Hudson, N. Y.: World book company, 1923.
Lua MLA (8ú heag.)Pickett, Lalla H., agus Duralde Boren. Early Childhood Education. World book company, 1923.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.