(1) Children with Down Syndrome: A Developmental Perspective Dante Cicchetti; Marjorie Beeghly ISBN: 9780521386678 Cambridge University Press View at publisher
(2) Essays on Self-Reference Niklas Luhmann ISBN: 9780231063685 Columbia University Press View at publisher
(3) Apprenticeship in Thinking: Cognitive Development in Social Context Barbara Rogoff ISBN: 9780195059731 Oxford University Press View at publisher