APA (7th ed.) Citation

(2001). Anno: K20, K21 ; Jahresbericht.

Chicago Style (17th ed.) Citation

Anno: K20, K21 ; Jahresbericht. Düsseldorf, 2001.

MLA (8th ed.) Citation

Anno: K20, K21 ; Jahresbericht. 2001.

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