Rebecca C.R.C.LancefieldRebecca C.R.C., A Serological Differentiation of Human and Other Groups of Hemolytic Streptococci, „The Journal of Experimental Medicine”, 57 (4), 1933, s. 571–595, DOI: 10.1084/jem.57.4.571, PMID: 19870148, PMCID: PMC2132252 [dostęp 2021-02-16].
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Rebecca C.R.C.LancefieldRebecca C.R.C., A Serological Differentiation of Human and Other Groups of Hemolytic Streptococci, „The Journal of Experimental Medicine”, 57 (4), 1933, s. 571–595, DOI: 10.1084/jem.57.4.571, PMID: 19870148, PMCID: PMC2132252 [dostęp 2021-02-16].