APA (7th ed.) Citation

Ricardo, D., & Bonar, J. (2011). Letters of David Ricardo to Thomas Robert Malthus, 1810-1823. Project Gutenberg.

Chicago Style (17th ed.) Citation

Ricardo, David, and James Bonar. Letters of David Ricardo to Thomas Robert Malthus, 1810-1823. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Ricardo, David, and James Bonar. Letters of David Ricardo to Thomas Robert Malthus, 1810-1823. Project Gutenberg, 2011.

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