Robert ashton. (2007). The life plan: 700 simple ways to change your life for the better. Pearson education.
シカゴスタイル引用形Robert ashton. The Life Plan: 700 Simple Ways to Change Your Life for the Better. New delhi: Pearson education, 2007.
MLA引用形式Robert ashton. The Life Plan: 700 Simple Ways to Change Your Life for the Better. Pearson education, 2007.
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