Cita APA (7a ed.)

Mekelburger, H. (1909). [Johannes Trojan]. s.n.].

Cita Chicago Style (17a ed.)

Mekelburger, Hans. [Johannes Trojan]. [Gdańsk: s.n.], 1909.

Cita MLA (9a ed.)

Mekelburger, Hans. [Johannes Trojan]. s.n.], 1909.