APA (7th ed.) Citation

Glenn, O. E. (2006). A Treatise on the Theory of Invariants. Project Gutenberg.

Chicago Style (17th ed.) Citation

Glenn, Oliver E. A Treatise on the Theory of Invariants. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Glenn, Oliver E. A Treatise on the Theory of Invariants. Project Gutenberg, 2006.

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