COVEY STEPHEN R. (2000). PORTABLE 7 HABITS SYNERGY. MAGNA PUBLISHING CO LTS.
Cita Chicago (17th ed.)COVEY STEPHEN R. PORTABLE 7 HABITS SYNERGY. MUMBAI: MAGNA PUBLISHING CO LTS, 2000.
Cita MLA (9th ed.)COVEY STEPHEN R. PORTABLE 7 HABITS SYNERGY. MAGNA PUBLISHING CO LTS, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.