APA aipamena

Covey, S. R. (2002). First Things First. Pocket Books Ltd.

Chicago Style aipamena

Covey, Stephen R. First Things First. London: Pocket Books Ltd, 2002.

MLA aipamena

Covey, Stephen R. First Things First. Pocket Books Ltd, 2002.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.