APA aipamena

Helgason, S., & Old, D. C. (1981). Comparison of four methods of differential typing of isolates of Shigella sonnei. Cambridge University Press.

Chicago Style aipamena

Helgason, S., and D. C. Old. Comparison of Four Methods of Differential Typing of Isolates of Shigella Sonnei. Cambridge University Press, 1981.

MLA aipamena

Helgason, S., and D. C. Old. Comparison of Four Methods of Differential Typing of Isolates of Shigella Sonnei. Cambridge University Press, 1981.