APA aipamena

de Bono, A. H., English, T. A., & Milstein, B. B. (1978). Heart valve replacement in the elderly.

Chicago Style aipamena

de Bono, A H., T A. English, and B B. Milstein. Heart Valve Replacement in the Elderly. 1978.

MLA aipamena

de Bono, A H., T A. English, and B B. Milstein. Heart Valve Replacement in the Elderly. 1978.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.