Clark Wortham. (2013). Common Characteristics and Unique Qualities in Preschool Programs (1.). Springer Netherlands.
Chicago-referens (17:e uppl.)Clark Wortham. Common Characteristics and Unique Qualities in Preschool Programs. 1. Springer Netherlands, 2013.
MLA-referens (8:e uppl.)Clark Wortham. Common Characteristics and Unique Qualities in Preschool Programs. 1. Springer Netherlands, 2013.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.