Stuart J. Murphy. (1996). "Ready, Set, Hop! (MathStart 3)". HarperCollins.
Lua i Stíl Chicago (17ú heag.)Stuart J. Murphy. "Ready, Set, Hop! (MathStart 3)". HarperCollins, 1996.
Lua MLA (9ú heag.)Stuart J. Murphy. "Ready, Set, Hop! (MathStart 3)". HarperCollins, 1996.
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