Autor, A. C. (1977). Difficulties encountered by elementary school pupils in interpreting graphs.
Lua i Stíl Chicago (17ú heag.)Autor, Anita Clacio-. Difficulties Encountered by Elementary School Pupils in Interpreting Graphs. 1977.
Lua MLA (9ú heag.)Autor, Anita Clacio-. Difficulties Encountered by Elementary School Pupils in Interpreting Graphs. 1977.
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