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.
শিকাগো স্টাইলে সাইটেশনSierra Ramos, Rafaela, Nubia Muñoz Calero, Salvador Peña, I. Biemond, W. van Duijn, C. B. H. W. Lamers, Sibylle Teuchmann, S. Hernández, এবং 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.
এমএলএ সাইটেশনSierra 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.