Hartson, M. G. (1946). A study of the influence of color on the preschool child's selection of certain cooked vegetables during the noon lunch program at the Pennsylvania State College Nursery School: A thesis.
Lua i Stíl Chicago (17ú heag.)Hartson, Margaret Grace. A Study of the Influence of Color on the Preschool Child's Selection of Certain Cooked Vegetables During the Noon Lunch Program at the Pennsylvania State College Nursery School: A Thesis. 1946.
Lua MLA (8ú heag.)Hartson, Margaret Grace. A Study of the Influence of Color on the Preschool Child's Selection of Certain Cooked Vegetables During the Noon Lunch Program at the Pennsylvania State College Nursery School: A Thesis. 1946.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.