Tohutoro APA (7th ed.)
Letchford, S. (1977). Business mathematics and statistics (2nd.ed.). Donnington.
Tohutoru Kātū Chicago (17th ed.)
Letchford, S. Business Mathematics and Statistics. 2nd.ed. London: Donnington, 1977.
Tohutoro MLA (9th ed.)
Letchford, S. Business Mathematics and Statistics. 2nd.ed. Donnington, 1977.
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