APA citiranje

Tytgat, G. N. J., Langenberg, M. L., Rauws, E. A. J., Noach, L. A., & Dankert, J. (1991). Helicobacter pylori infection and duodenal ulcer.

Citação norma Chicago

Tytgat, G N J., M L. Langenberg, E A J. Rauws, L A. Noach, and J. Dankert. Helicobacter Pylori Infection and Duodenal Ulcer. 1991.

MLA citiranje

Tytgat, G N J., et al. Helicobacter Pylori Infection and Duodenal Ulcer. 1991.