Heydt, F. v. d. (1949). Das Patentamt Der Heliand.
Chicago Style (17th ed.) CitationHeydt, Fritz von der. "Das Patentamt." Der Heliand 1949.
MLA (8th ed.) CitationHeydt, Fritz von der. "Das Patentamt." Der Heliand, 1949.
Warning: These citations may not always be 100% accurate.