Wade, N. (1998). DNA breakthrough offers hope for syphilis vaccine. Today.
Chicago Style aipamenaWade, Nicholas. "DNA Breakthrough Offers Hope for Syphilis Vaccine." Today 1998.
MLA aipamenaWade, Nicholas. "DNA Breakthrough Offers Hope for Syphilis Vaccine." Today, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.