Lua APA (7ú heag.)

Friedl, A. E. (2001). Teaching science to children: An inquiry approach (5th ed.). McGraw-Hill.

Lua i Stíl Chicago (17ú heag.)

Friedl, Alfred E. Teaching Science to Children: An Inquiry Approach. 5th ed. Boston: McGraw-Hill, 2001.

Lua MLA (9ú heag.)

Friedl, Alfred E. Teaching Science to Children: An Inquiry Approach. 5th ed. McGraw-Hill, 2001.

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