Wessels, Michael R. (2016). Pharyngitis and Scarlet Fever. У Ferretti, Joseph J.; Stevens, Dennis L.; Fischetti, Vincent A. (ред.). Streptococcus pyogenes: Basic Biology to Clinical Manifestations. Oklahoma City (OK): University of Oklahoma Health Sciences Center. PMID26866221. Архів оригіналу за 3 March 2021. Процитовано 28 January 2018.
Wessels, Michael R. (2016). Pharyngitis and Scarlet Fever. У Ferretti, Joseph J.; Stevens, Dennis L.; Fischetti, Vincent A. (ред.). Streptococcus pyogenes: Basic Biology to Clinical Manifestations. Oklahoma City (OK): University of Oklahoma Health Sciences Center. PMID26866221. Архів оригіналу за 3 March 2021. Процитовано 28 January 2018.
Wessels, Michael R. (2016). Pharyngitis and Scarlet Fever. У Ferretti, Joseph J.; Stevens, Dennis L.; Fischetti, Vincent A. (ред.). Streptococcus pyogenes: Basic Biology to Clinical Manifestations. Oklahoma City (OK): University of Oklahoma Health Sciences Center. PMID26866221. Архів оригіналу за 3 March 2021. Процитовано 28 January 2018.