Richardson, C. (1935). An introduction to statistical analysis. Harcourt, Brace.
Lua i Stíl Chicago (17ú heag.)Richardson, C.H. An Introduction to Statistical Analysis. New York: Harcourt, Brace, 1935.
Lua MLA (9ú heag.)Richardson, C.H. An Introduction to Statistical Analysis. Harcourt, Brace, 1935.
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