Westling, D. L., & Lise Fox. (2000). Teaching students with severe disabilities (2nd ed.). Prentice Hall.
Chicago-viite (17. p.)Westling, David L., ja Lise Fox. Teaching Students with Severe Disabilities. 2nd ed. Upper Saddle River, N.J: Prentice Hall, 2000.
MLA-viite (9. p.)Westling, David L., ja Lise Fox. Teaching Students with Severe Disabilities. 2nd ed. Prentice Hall, 2000.
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