Stuart J. Murphy. (1996). "Ready, Set, Hop! (MathStart 3)". HarperCollins.
芝加哥风格引文Stuart J. Murphy. "Ready, Set, Hop! (MathStart 3)". HarperCollins, 1996.
MLA引文Stuart J. Murphy. "Ready, Set, Hop! (MathStart 3)". HarperCollins, 1996.
警告：这些引文格式不一定是100％准确.