APA (7th ed.) Citation
Oppenheim, S. (1911). Probleme der modernen Astronomie.
Chicago Style (17th ed.) Citation
Oppenheim, Samuel. Probleme Der Modernen Astronomie. Leipzig, 1911.
MLA (9th ed.) Citation
Oppenheim, Samuel. Probleme Der Modernen Astronomie. 1911.
Warning: These citations may not always be 100% accurate.