Knüppel, H. .
Chicago Style (17th ed.) CitationKnüppel, Helmut. .
MLA (9th ed.) CitationKnüppel, Helmut. .
Warning: These citations may not always be 100% accurate.
APA (7th ed.) Citation
Knüppel, H. .
Chicago Style (17th ed.) CitationKnüppel, Helmut. .
MLA (9th ed.) CitationKnüppel, Helmut. .