Παραπομπή σε μορφή APA (7η εκδ.)

Sigman, M., & Ruskin, E. (1999). Continuity and change in the social competence of children with autism, down syndrome, and developmental delays. Blackwell.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Sigman, Marian, και Ellen Ruskin. Continuity and Change in the Social Competence of Children with Autism, Down Syndrome, and Developmental Delays. Maldon, MA: Blackwell, 1999.

Παραπομπή σε μορφή MLA (9th εκδ.)

Sigman, Marian, και Ellen Ruskin. Continuity and Change in the Social Competence of Children with Autism, Down Syndrome, and Developmental Delays. Blackwell, 1999.