APA (7th ed.) Citation

Engels, F., & Lewis, A. (2009). Feuerbach: The roots of the socialist philosophy. Project Gutenberg.

Chicago Style (17th ed.) Citation

Engels, Friedrich, and Austin Lewis. Feuerbach: The Roots of the Socialist Philosophy. Project Gutenberg, 2009.

MLA (9th ed.) Citation

Engels, Friedrich, and Austin Lewis. Feuerbach: The Roots of the Socialist Philosophy. Project Gutenberg, 2009.

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