Siegler, R. S., & Alibali, M. W. (2005). Children's thinking (4th ed.). Pearson/Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Siegler, Robert S., agus Martha Wagner Alibali. Children's Thinking. 4th ed. Upper Saddle River, N.J: Pearson/Prentice Hall, 2005.
Lua MLA (9ú heag.)Siegler, Robert S., agus Martha Wagner Alibali. Children's Thinking. 4th ed. Pearson/Prentice Hall, 2005.
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