APA (7th ed.) Citation

Lagrange, J. L., & McCormack, T. J. (2011). Lectures on Elementary Mathematics. Project Gutenberg.

Chicago Style (17th ed.) Citation

Lagrange, Joseph Louis, and Thomas J. McCormack. Lectures on Elementary Mathematics. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Lagrange, Joseph Louis, and Thomas J. McCormack. Lectures on Elementary Mathematics. Project Gutenberg, 2011.

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