Yin/yang

MLA

Roggeman, Willy. Yin/yang. ['s-Gravenhage]: Nijgh & Van Ditmar, 1962.

APA

Roggeman, W. (1962). Yin/yang. ['s-Gravenhage]: Nijgh & Van Ditmar.

Chicago

Roggeman, Willy, Yin/yang. ['s-Gravenhage]: Nijgh & Van Ditmar, 1962.