Lua APA (7ú heag.)

Letchford, S. (1977). Business mathematics and statistics (2nd.ed.). Donnington.

Lua i Stíl Chicago (17ú heag.)

Letchford, S. Business Mathematics and Statistics. 2nd.ed. London: Donnington, 1977.

Lua MLA (9ú heag.)

Letchford, S. Business Mathematics and Statistics. 2nd.ed. Donnington, 1977.

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