Cita APA (7a ed.)

Koenen, K. C. (2002). A twin registry study of familial and individual risk factors for trauma exposure and posttraumatic stress disorder. [s.n.].

Cita Chicago Style (17a ed.)

Koenen, Karestan C. A Twin Registry Study of Familial and Individual Risk Factors for Trauma Exposure and Posttraumatic Stress Disorder. [S.l.]: [s.n.], 2002.

Cita MLA (9a ed.)

Koenen, Karestan C. A Twin Registry Study of Familial and Individual Risk Factors for Trauma Exposure and Posttraumatic Stress Disorder. [s.n.], 2002.