Citação norma APA

Sybrecht, G. W. (2010). Correspondence (letter to the editor): Smoking—A Study That Leaves Many Questions Unanswered. Deutscher Arzte Verlag.

Citação norma Chicago

Sybrecht, Gerhard W. Correspondence (letter to the Editor): Smoking—A Study That Leaves Many Questions Unanswered. Deutscher Arzte Verlag, 2010.

Citação norma MLA

Sybrecht, Gerhard W. Correspondence (letter to the Editor): Smoking—A Study That Leaves Many Questions Unanswered. Deutscher Arzte Verlag, 2010.

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