APA (7th ed.) Citation

Willard, H. H. (1956). Elements of quantitative analysis: Theory and practice (4th ed.). Van Nostrand.

Chicago Style (17th ed.) Citation

Willard, Hobart H. Elements of Quantitative Analysis: Theory and Practice. 4th ed. Princeton, N.J.: Van Nostrand, 1956.

MLA (9th ed.) Citation

Willard, Hobart H. Elements of Quantitative Analysis: Theory and Practice. 4th ed. Van Nostrand, 1956.