APA (7th ed.) Citation

Higgs, M. (2012). Glimpses into the Abyss. Project Gutenberg.

Chicago Style (17th ed.) Citation

Higgs, Mary. Glimpses into the Abyss. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Higgs, Mary. Glimpses into the Abyss. Project Gutenberg, 2012.

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