APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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