APA (7th ed.) Citation

(1920). Copyright, Denmark; by President of U.S.A, proclamation. [publisher not identified].

Chicago Style (17th ed.) Citation

Copyright, Denmark; by President of U.S.A, Proclamation. [Washington]: [publisher not identified], 1920.

MLA (9th ed.) Citation

Copyright, Denmark; by President of U.S.A, Proclamation. [publisher not identified], 1920.

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