COVEY STEPHEN R. (2000). PORTABLE 7 HABITS CHOICE. MAGNA PUBLISHING CO LTS.
Chicagoスタイル(17版)引用形式COVEY STEPHEN R. PORTABLE 7 HABITS CHOICE. MUMBAI: MAGNA PUBLISHING CO LTS, 2000.
MLA(9版)引用形式COVEY STEPHEN R. PORTABLE 7 HABITS CHOICE. MAGNA PUBLISHING CO LTS, 2000.
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