APA (7th ed.) Citation

Mitford, B. (2010). A Frontier Mystery. Project Gutenberg.

Chicago Style (17th ed.) Citation

Mitford, Bertram. A Frontier Mystery. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Mitford, Bertram. A Frontier Mystery. Project Gutenberg, 2010.

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