APA (7th ed.) Citation

Glyn, E. (2004). One Day A sequel to 'Three Weeks'. Project Gutenberg.

Chicago Style (17th ed.) Citation

Glyn, Elinor. One Day A Sequel to 'Three Weeks'. Project Gutenberg, 2004.

MLA (9th ed.) Citation

Glyn, Elinor. One Day A Sequel to 'Three Weeks'. Project Gutenberg, 2004.

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