Flake, O. (1947). Old Man: Roman / Otto Flake (1. - 10. Tsd.). Schleber.
Cita Chicago (17th ed.)Flake, Otto. Old Man: Roman / Otto Flake. 1. - 10. Tsd. Kassel: Schleber, 1947.
Cita MLA (8th ed.)Flake, Otto. Old Man: Roman / Otto Flake. 1. - 10. Tsd. Schleber, 1947.
Atenció: Aquestes cites poden no estar 100% correctes.