Brüning, A., & Brüning, W. (2018). Schlaumacherbuch: Astrid und Wilfried Brüning. Brüning Film.
Cita Chicago (17th ed.)Brüning, Astrid, i Wilfried Brüning. Schlaumacherbuch: Astrid Und Wilfried Brüning. [Detmold]: Brüning Film, 2018.
Cita MLA (8th ed.)Brüning, Astrid, i Wilfried Brüning. Schlaumacherbuch: Astrid Und Wilfried Brüning. Brüning Film, 2018.
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