Cita APA (7a ed.)

Feil, O., & Winkeler, L. (1950). Leo Winkeler.

Cita Chicago Style (17a ed.)

Feil, Otto, y Leo Winkeler. Leo Winkeler. [S. l, 1950.

Cita MLA (9a ed.)

Feil, Otto, y Leo Winkeler. Leo Winkeler. 1950.