APA (7e ed.) Bronvermelding

Keller, G., & Warrack, B. (1997). Statistics for management and economics (4a. ed.). International Thomson.

Chicago (17e ed.) Bronvermelding

Keller, Gerald, en Brian Warrack. Statistics for Management and Economics. 4a. ed. Belmont: International Thomson, 1997.

MLA (9e ed.) Bronvermelding

Keller, Gerald, en Brian Warrack. Statistics for Management and Economics. 4a. ed. International Thomson, 1997.