APA (7e ed.) Bronvermelding

Downie, N. M., & Heath,R.W. (1983). Basic statistical methods (5th ed.). National Book Store.

Chicago (17e ed.) Bronvermelding

Downie, Norville M., en Heath,R.W. Basic Statistical Methods. 5th ed. Manila: National Book Store, 1983.

MLA (9e ed.) Bronvermelding

Downie, Norville M., en Heath,R.W. Basic Statistical Methods. 5th ed. National Book Store, 1983.