COVEY STEPHEN R. (1999). LIVING THE 7 HABITS: STORIES OF COURAGE AND INSPIRATION. FIRESIDE BOOK.
Chicago Style aipamenaCOVEY STEPHEN R. LIVING THE 7 HABITS: STORIES OF COURAGE AND INSPIRATION. NEW YORK: FIRESIDE BOOK, 1999.
MLA aipamenaCOVEY STEPHEN R. LIVING THE 7 HABITS: STORIES OF COURAGE AND INSPIRATION. FIRESIDE BOOK, 1999.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.