APA (7th ed.) Citation

Hart, W. W. (1940). Essential of algebra, first course. D. C. Heath & Company.

Chicago Style (17th ed.) Citation

Hart, Walter W. Essential of Algebra, First Course. Boston: D. C. Heath & Company, 1940.

MLA (9th ed.) Citation

Hart, Walter W. Essential of Algebra, First Course. D. C. Heath & Company, 1940.