APA (7th ed.) Citation

Fullerton, G. S. (2005). An Introduction to Philosophy. Project Gutenberg.

Chicago Style (17th ed.) Citation

Fullerton, George Stuart. An Introduction to Philosophy. Project Gutenberg, 2005.

MLA (9th ed.) Citation

Fullerton, George Stuart. An Introduction to Philosophy. Project Gutenberg, 2005.

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