Cita APA (7th ed.)

Chesterton, G. K. (1977). Das unlösbare Problem. Das Neue Berlin.

Cita Chicago (17th ed.)

Chesterton, Gilbert Keith. Das Unlösbare Problem. Berlin: Das Neue Berlin, 1977.

Cita MLA (8th ed.)

Chesterton, Gilbert Keith. Das Unlösbare Problem. Das Neue Berlin, 1977.