Lua APA (7ú heag.)

Stuart J. Murphy. (1997). "Betcha! Estimating (Mathstart, Level 3)". HarperCollins.

Lua i Stíl Chicago (17ú heag.)

Stuart J. Murphy. "Betcha! Estimating (Mathstart, Level 3)". HarperCollins, 1997.

Lua MLA (9ú heag.)

Stuart J. Murphy. "Betcha! Estimating (Mathstart, Level 3)". HarperCollins, 1997.

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