Allen, D. (2015). Getting Things Done The art of Stress Free Productivity. Piatkus.
Chicagoスタイル(17版)引用形式Allen, David. Getting Things Done The Art of Stress Free Productivity. London: Piatkus, 2015.
MLA(9版)引用形式Allen, David. Getting Things Done The Art of Stress Free Productivity. Piatkus, 2015.
警告: この引用は必ずしも正確ではありません.