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.