Cita APA (7th ed.)

Thelen, K. (2007). Paul Schwer: In progress. Kettler Druck.

Cita Chicago (17th ed.)

Thelen, Klaus. Paul Schwer: In Progress. Bönen: Kettler Druck, 2007.

Cita MLA (8th ed.)

Thelen, Klaus. Paul Schwer: In Progress. Kettler Druck, 2007.