Ray, R. (2008). Time management: Resource one without a second.
シカゴスタイル引用形Ray, Reuben. Time Management: Resource One Without a Second. Himalaya Publishing House, 2008.
MLA引用形式Ray, Reuben. Time Management: Resource One Without a Second. 2008.
警告: この引用は必ずしも正確ではありません.