Kumin, L. (2012). Early communication skills for children with down syndrome: A guide for parents and professionals (Third edition.). Woodbinehouse.
Chicago-referens (17:e uppl.)Kumin, Libby. Early Communication Skills for Children with Down Syndrome: A Guide for Parents and Professionals. Third edition. Bethesda, MD: Woodbinehouse, 2012.
MLA-referens (9:e uppl.)Kumin, Libby. Early Communication Skills for Children with Down Syndrome: A Guide for Parents and Professionals. Third edition. Woodbinehouse, 2012.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.