Citação norma APA

Fredrick, K., & Helmann, J. D. (1997). RNA polymerase sigma factor determines start-site selection but is not required for upstream promoter element activation on heteroduplex (bubble) templates. The National Academy of Sciences of the USA.

Citação norma Chicago

Fredrick, Kurt, and John D. Helmann. RNA Polymerase Sigma Factor Determines Start-site Selection but Is Not Required for Upstream Promoter Element Activation On Heteroduplex (bubble) templates. The National Academy of Sciences of the USA, 1997.

Citação norma MLA

Fredrick, Kurt, and John D. Helmann. RNA Polymerase Sigma Factor Determines Start-site Selection but Is Not Required for Upstream Promoter Element Activation On Heteroduplex (bubble) templates. The National Academy of Sciences of the USA, 1997.

Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.