Virulence. Cambridge University Press.
Chicago-čujuhus (17. p.)Virulence. Cambridge University Press.
MLA-čujuhus (9. p.)Virulence. Cambridge University Press.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.
APA-čujuhus (7. p.)