Cita APA (7th ed.)

Becker, F. (1943). Blick in das Weltall (o.A.). Philipp Reclam jun..

Cita Chicago (17th ed.)

Becker, Friedrich. Blick in Das Weltall. o.A. Leipzig: Philipp Reclam jun., 1943.

Cita MLA (8th ed.)

Becker, Friedrich. Blick in Das Weltall. o.A. Philipp Reclam jun., 1943.