Özalp, Meral, et al. “Distribution of Serotypes and Antimicrobial Resistance of Streptococcus Pneumoniae in a children’s Hospital in Turkey”. The Turkish Journal of Pediatrics, vol. 46, no. 4, Oct. 2004, pp. 329-32, https://doi.org/10.24953/turkjpediatr.2004.2829.