APA aipamena

Sierra Ramos, R., Muñoz Calero, N., Peña, S., Biemond, I., van Duijn, W., Lamers, C. B. H. W., . . . Correa, P. (1992). Antibodies to Helicobacter pylori and pepsinogen levels in children from Costa Rica: Comparison of two areas with different risks for stomach cáncer.

Chicago Style aipamena

Sierra Ramos, Rafaela, Nubia Muñoz Calero, Salvador Peña, I. Biemond, W. van Duijn, C. B. H. W. Lamers, Sibylle Teuchmann, S. Hernández, y P. Correa. Antibodies to Helicobacter Pylori and Pepsinogen Levels in Children From Costa Rica: Comparison of Two Areas With Different Risks for Stomach Cáncer. 1992.

MLA aipamena

Sierra Ramos, Rafaela, et al. Antibodies to Helicobacter Pylori and Pepsinogen Levels in Children From Costa Rica: Comparison of Two Areas With Different Risks for Stomach Cáncer. 1992.