Oorspronklik: The Brecht-Eisler Song Book. Come Out And Fight. Bertolt Brecht. Voice sheet music. 1898-1956. and Hanns Eisler. 1898-1962.
Vertaling: Die Brecht-Eisler Song Book. Die Poplar Tree Op Karl. Voice bladmusiek. Die Brecht-Eisler Song Book saamgestel deur Bertolt Brecht.