APA aipamena

Debono, E. (1977). The happiness purpose. Penguin.

Chicago Style aipamena

Debono, Edward. The Happiness Purpose. England: Penguin, 1977.

MLA aipamena

Debono, Edward. The Happiness Purpose. Penguin, 1977.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.