APA citiranje

Roberts, S. E., Button, L. A., & Williams, J. G. (2012). Prognosis following Upper Gastrointestinal Bleeding. Public Library of Science.

Citação norma Chicago

Roberts, Stephen E., Lori A. Button, and John G. Williams. Prognosis Following Upper Gastrointestinal Bleeding. Public Library of Science, 2012.

MLA citiranje

Roberts, Stephen E., Lori A. Button, and John G. Williams. Prognosis Following Upper Gastrointestinal Bleeding. Public Library of Science, 2012.