APA aipamena

Covey, S. R. (2004). The 7 Habits of Highly Effective People. Pocket Books.

Chicago Style aipamena

Covey, Stephen R. The 7 Habits of Highly Effective People. Pocket Books, 2004.

MLA aipamena

Covey, Stephen R. The 7 Habits of Highly Effective People. Pocket Books, 2004.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.