Citazione Stile APA (7a Edizione)

Great Britain. Patent Office. (1869). Patents for inventions: Abridgements of specifications relating to writing instruments and materials. Office of the Commissioners of Patents for Inventions.

Citazione stile Chigago Style (17a edizione)

Great Britain. Patent Office. Patents for Inventions: Abridgements of Specifications Relating to Writing Instruments and Materials. Lond.: Office of the Commissioners of Patents for Inventions, 1869.

Citatione MLA (8a ed.)

Great Britain. Patent Office. Patents for Inventions: Abridgements of Specifications Relating to Writing Instruments and Materials. Office of the Commissioners of Patents for Inventions, 1869.

Attenzione: Queste citazioni potrebbero non essere precise al 100%.