Pollard, A., Scheifele, D., & Rosenstein, N. (2001). Epidemiology of meningococcal disease in north america.
Chicago Style aipamenaPollard, A., D. Scheifele, and N. Rosenstein. Epidemiology of Meningococcal Disease in North America. 2001.
MLA aipamenaPollard, A., et al. Epidemiology of Meningococcal Disease in North America. 2001.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.