APA (7th ed.) Citation

Ahnert, P. (1974). Kleine praktische Astronomie (o.A.). Johann Ambrosius Barth.

Chicago Style (17th ed.) Citation

Ahnert, Paul. Kleine Praktische Astronomie. o.A. Leipzig: Johann Ambrosius Barth, 1974.

MLA (8th ed.) Citation

Ahnert, Paul. Kleine Praktische Astronomie. o.A. Johann Ambrosius Barth, 1974.

Warning: These citations may not always be 100% accurate.