Sampson, J. S., O'Connor, S. P., Stinson, A. R., Tharpe, J. A., & Russell, H. (1994). Cloning and nucleotide sequence analysis of psaA, the Streptococcus pneumoniae gene encoding a 37-kilodalton protein homologous to previously reported Streptococcus sp. adhesins.

Sampson, J S., S P. O'Connor, A R. Stinson, J A. Tharpe, e H. Russell. Cloning and Nucleotide Sequence Analysis of PsaA, the Streptococcus Pneumoniae Gene Encoding a 37-kilodalton Protein Homologous to Previously Reported Streptococcus Sp. Adhesins. 1994.

Sampson, J S., et al. Cloning and Nucleotide Sequence Analysis of PsaA, the Streptococcus Pneumoniae Gene Encoding a 37-kilodalton Protein Homologous to Previously Reported Streptococcus Sp. Adhesins. 1994.