APA-referens (7:e uppl.)

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.