Salmon, G. 1., & Salmon, G. 1. (1954). A Treatise on conic sections: Containing an account of some of the most important modern algebraic and geometric methods (6. edition.). New York, New York: Chelsea.

Salmon, George 1819-1904, and George 1819-1904 Salmon. A Treatise On Conic Sections: Containing an Account of Some of the Most Important Modern Algebraic and Geometric Methods. 6. edition. New York, New York: Chelsea, 1954.

Salmon, George 1819-1904, and George 1819-1904 Salmon. A Treatise On Conic Sections: Containing an Account of Some of the Most Important Modern Algebraic and Geometric Methods. 6. edition. New York, New York: Chelsea, 1954.