APA (7th ed.) Citation

Burns, R. (2006). The Letters of Robert Burns. Project Gutenberg.

Chicago Style (17th ed.) Citation

Burns, Robert. The Letters of Robert Burns. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Burns, Robert. The Letters of Robert Burns. Project Gutenberg, 2006.

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