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Dyfyniad Arddull ChicagoJohnson, Mary K., David Hamon, and Gloria K. Drew. "Isolation and Characterization of Pneumolysin-Negative Mutants of Streptococcus Pneumoniae." Infect Immun 1982.
Dyfyniad MLAJohnson, Mary K., David Hamon, and Gloria K. Drew. "Isolation and Characterization of Pneumolysin-Negative Mutants of Streptococcus Pneumoniae." Infect Immun 1982.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.