APA (7th ed.) Citation

(1932). A key to Esperanto: (angla). British Esperanto Assoc.

Chicago Style (17th ed.) Citation

A Key to Esperanto: (angla). London: British Esperanto Assoc, 1932.

MLA (9th ed.) Citation

A Key to Esperanto: (angla). British Esperanto Assoc, 1932.

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