Willard, H. H., & Furman, N. H. (1933). Elementary quantitative analysis: Theory and practice. D. Van Nostrand company, inc.
Lua i Stíl Chicago (17ú heag.)Willard, Hobart Hurd, agus N. Howell Furman. Elementary Quantitative Analysis: Theory and Practice. New York: D. Van Nostrand company, inc, 1933.
Lua MLA (9ú heag.)Willard, Hobart Hurd, agus N. Howell Furman. Elementary Quantitative Analysis: Theory and Practice. D. Van Nostrand company, inc, 1933.
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