MLA

s.n. Methode Dupuis; Zittende Man. [S.l.]: [s.n.], .

APA

s.n, s. (.). Methode Dupuis; zittende man. [S.l.]: [s.n.].

Chicago

s.n. Methode Dupuis; Zittende Man. [S.l.]: [s.n.], ..