Handley, B. (2004). SPEED matthematics: Secret Skills for Quick Calculation. Bandung : Pakae raya.
Lua i Stíl Chicago (17ú heag.)Handley, Bill. SPEED Matthematics: Secret Skills for Quick Calculation. Bandung : Pakae raya, 2004.
Lua MLA (8ú heag.)Handley, Bill. SPEED Matthematics: Secret Skills for Quick Calculation. Bandung : Pakae raya, 2004.
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