Παραπομπή APA

COVEY, S. R. (1997). The seven habits of highly effective people. Jakarta: Binarupa Aksara.

Παραπομπή Chicago Style

COVEY, Stephen R. The Seven Habits of Highly Effective People. Jakarta: Binarupa Aksara, 1997.

Παραπομπή MLA

COVEY, Stephen R. The Seven Habits of Highly Effective People. Jakarta: Binarupa Aksara, 1997.

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