APA (7th ed.) Citation

Leland, O. M. (1921). Practical least squares. McGraw-Hill.

Chicago Style (17th ed.) Citation

Leland, Ora Miner. Practical Least Squares. New York: McGraw-Hill, 1921.

MLA (9th ed.) Citation

Leland, Ora Miner. Practical Least Squares. McGraw-Hill, 1921.