APA aipamena

Chopra ,V.S. (1972). Productivity. Cr. Council.

Chicago Style aipamena

Chopra ,V.S. Productivity. Cr. Council, 1972.

MLA aipamena

Chopra ,V.S. Productivity. Cr. Council, 1972.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.