APA (7th ed.) Citation

Dollfus, W. Luftverkehr. [o. Verl.].

Chicago Style (17th ed.) Citation

Dollfus, Walter. Luftverkehr. [s. l.]: [o. Verl.].

MLA (9th ed.) Citation

Dollfus, Walter. Luftverkehr. [o. Verl.].

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