Summers, G. W., Peters, W. S., & Armstrong, C. P. (1977). Basic statistics in business and economics (2d ed.). Wadsworth Pub. Co..
Lua i Stíl Chicago (17ú heag.)Summers, George W., William S. Peters, agus Charles P. Armstrong. Basic Statistics in Business and Economics. 2d ed. Belmont, Calif.: Wadsworth Pub. Co., 1977.
Lua MLA (8ú heag.)Summers, George W., et al. Basic Statistics in Business and Economics. 2d ed. Wadsworth Pub. Co., 1977.
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