Letley, D. P., Lastovica, A., Louw, J. A., Hawkey, C. J., & Atherton, J. C. (1999). Allelic Diversity of the Helicobacter pylori Vacuolating Cytotoxin Gene in South Africa: Rarity of the vacA s1a Genotype and Natural Occurrence of an s2/m1 Allele. American Society for Microbiology.
Čikaški stil citiranjaLetley, D. P., A. Lastovica, J. A. Louw, C. J. Hawkey, i J. C. Atherton. Allelic Diversity of the Helicobacter Pylori Vacuolating Cytotoxin Gene in South Africa: Rarity of the VacA S1a Genotype and Natural Occurrence of an S2/m1 Allele. American Society for Microbiology, 1999.
MLA način citiranjaLetley, D. P., et al. Allelic Diversity of the Helicobacter Pylori Vacuolating Cytotoxin Gene in South Africa: Rarity of the VacA S1a Genotype and Natural Occurrence of an S2/m1 Allele. American Society for Microbiology, 1999.