APA Citation

(2017). Hildegard Voigt. [Gehrde?]: [Herbert Kämper?].

Chicago Style Citation

Hildegard Voigt. [Gehrde?]: [Herbert Kämper?], 2017.

MLA Citation

Hildegard Voigt. [Gehrde?]: [Herbert Kämper?], 2017.

Warning: These citations may not always be 100% accurate.