Paul-Emile Janson.

MLA

Stengers, Jean. Paul-emile Janson. Bruxelles: s.n., 1973.

APA

Stengers, J. (1973). Paul-Emile Janson. Bruxelles: s.n.

Chicago

Stengers, Jean, Paul-Emile Janson. Bruxelles: s.n., 1973.