Lorenzo, E. L. E. (1994). Categorization of play activities by pre-schoolers.
Chicago-referens (17:e uppl.)Lorenzo, Edwina Lizett E. Categorization of Play Activities by Pre-schoolers. 1994.
MLA-referens (9:e uppl.)Lorenzo, Edwina Lizett E. Categorization of Play Activities by Pre-schoolers. 1994.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.