Lua APA (7ú heag.)

Richards, L. E. (1978). Business statistics: Why and when. McGraw - Hill.

Lua i Stíl Chicago (17ú heag.)

Richards, Larry E. Business Statistics: Why and When. New York: McGraw - Hill, 1978.

Lua MLA (9ú heag.)

Richards, Larry E. Business Statistics: Why and When. McGraw - Hill, 1978.

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