APA (7th ed.) Citation

Freud, S., & Hall, G. S. (2011). A General Introduction to Psychoanalysis. Project Gutenberg.

Chicago Style (17th ed.) Citation

Freud, Sigmund, and G. Stanley Hall. A General Introduction to Psychoanalysis. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Freud, Sigmund, and G. Stanley Hall. A General Introduction to Psychoanalysis. Project Gutenberg, 2011.

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