Foundation. 5. Hassold, T.J., D. Patterson (1999). editors, Down Syndrome: A Promising Future, Together. New York: Wiley Liss. 6. Kingsley, J., M. Levitz (1994)
vanderbei.princeton.edu. [2023-04-27]. (原始内容存档于2023-04-27). Fuller-Wright, Liz. Princeton astrophysicists re-imagine world map, designing a less distorted