Cita APA (7th ed.)

Douglas, W. W. (2005). Historische Tatsachen. TBR.

Cita Chicago (17th ed.)

Douglas, William W. Historische Tatsachen. Washington DC: TBR, 2005.

Cita MLA (8th ed.)

Douglas, William W. Historische Tatsachen. TBR, 2005.