APA (7th ed.) Citation

Sapir, E. (2004). Language An Introduction to the Study of Speech. Project Gutenberg.

Chicago Style (17th ed.) Citation

Sapir, Edward. Language An Introduction to the Study of Speech. Project Gutenberg, 2004.

MLA (9th ed.) Citation

Sapir, Edward. Language An Introduction to the Study of Speech. Project Gutenberg, 2004.

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