APA (7th ed.) Citation

Perry, R. B. (2008). The Approach to Philosophy. Project Gutenberg.

Chicago Style (17th ed.) Citation

Perry, Ralph Barton. The Approach to Philosophy. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Perry, Ralph Barton. The Approach to Philosophy. Project Gutenberg, 2008.

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