APA aipamena

Howden, C., & Kerr, G. D. (1986). Relapse of duodenal ulcer.

Chicago Style aipamena

Howden, Colin, and G D. Kerr. Relapse of Duodenal Ulcer. 1986.

MLA aipamena

Howden, Colin, and G D. Kerr. Relapse of Duodenal Ulcer. 1986.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.