Illingworth, C. F. W. (1952). Peptic Ulcer.
Chicago Style aipamenaIllingworth, C. F. W. Peptic Ulcer. 1952.
MLA aipamenaIllingworth, C. F. W. Peptic Ulcer. 1952.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
APA aipamena