Cita APA (7th ed.)

(2014). Ralf Peters: Keen insight. Bernhard Knaus Fine Art.

Cita Chicago (17th ed.)

Ralf Peters: Keen Insight. Frankfurt am Main: Bernhard Knaus Fine Art, 2014.

Cita MLA (8th ed.)

Ralf Peters: Keen Insight. Bernhard Knaus Fine Art, 2014.