Cita APA (7th ed.)

Day, R. A., & Underwood, A. L. 1. (1991). Quantitative analysis (6th ed.). Prentice Hall Intenational.

Cita Chicago (17th ed.)

Day, Reuben Alexander, i Arthur Louis 1924 Underwood. Quantitative Analysis. 6th ed. Englewooe Cliffs, NJ: Prentice Hall Intenational, 1991.

Cita MLA (9th ed.)

Day, Reuben Alexander, i Arthur Louis 1924 Underwood. Quantitative Analysis. 6th ed. Prentice Hall Intenational, 1991.