APA (7th ed.) Citation

Douglas, A. (2011). Endurance Test or, How Clear Grit Won the Day. Project Gutenberg.

Chicago Style (17th ed.) Citation

Douglas, Alan. Endurance Test or, How Clear Grit Won the Day. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Douglas, Alan. Endurance Test or, How Clear Grit Won the Day. Project Gutenberg, 2011.

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