Himmels-Brief Nr. 9. C. Burckardt's Nachf.
Cita Chicago (17th ed.)Himmels-Brief Nr. 9. Weissenburg: C. Burckardt's Nachf.
Cita MLA (8th ed.)Himmels-Brief Nr. 9. C. Burckardt's Nachf.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)