Cita APA (7th ed.)

Downie, N., & Heath, R. (1974). Basic statistical methods (4th ed.). National Book Store.

Cita Chicago (17th ed.)

Downie, N.M, i R.W Heath. Basic Statistical Methods. 4th ed. Manila: National Book Store, 1974.

Cita MLA (9th ed.)

Downie, N.M, i R.W Heath. Basic Statistical Methods. 4th ed. National Book Store, 1974.