APA aipamena

COVEY STEPHEN R. (2013). THE 7 HABITS OF HIGHLY EFECTIVE PEOPLE. Simmon & Schuster.

Chicago Style aipamena

COVEY STEPHEN R. THE 7 HABITS OF HIGHLY EFECTIVE PEOPLE. LONDON: Simmon & Schuster, 2013.

MLA aipamena

COVEY STEPHEN R. THE 7 HABITS OF HIGHLY EFECTIVE PEOPLE. Simmon & Schuster, 2013.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.