Bereiter, C., & Anderson, V. (1989). Willy the Wisher and other thinking stories: An Open Court thinking story book. Open Court.
Lua i Stíl Chicago (17ú heag.)Bereiter, Carl, agus Valerie Anderson. Willy the Wisher and Other Thinking Stories: An Open Court Thinking Story Book. La Salle, Ill.: Open Court, 1989.
Lua MLA (8ú heag.)Bereiter, Carl, agus Valerie Anderson. Willy the Wisher and Other Thinking Stories: An Open Court Thinking Story Book. Open Court, 1989.
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